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What is the logic behind how bash tests for true/false?
What is the difference between : and true?What is the builtin `:` used for in Bash?bash script trap for exit and err and logic for differenceWhat is the rationale behind $array not expanding the whole array in ksh and bash?extract columns from TRUE/FALSE matrix based on proportion of TRUE values within the columnExpression evaluates to false in for loop whereas it's true in ifWhy does `source foo && true` exit the script in bash?for loop logic porting from bash to cshBash: how can I run `sudo -n true` in the background without interfering with `read`?What's the purpose of “true” in bash “if sudo true; then”
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;
This:
$ echo $VAR
something
And this:
$ [[ -z "$VAR" ]]
$ echo $?
1
Yet this:
if [[ -z "$TMUX_MAN_PANE" ]]; then
echo 'NEVER PRINTS!'
This screws with my head.
UPDATE
Here's some real code. I can't get this to work.
tmux_man_page()
if [[ "$TERM" =~ 'screen' ]] && [[ -n "$TMUX" ]]; then
tmux list-panes -t $TMUX_MAN_PANE &> /dev/null
echo $?
echo $TMUX_MAN_PANE
[[ -z "$TMUX_MAN_PANE" ]]
echo $?
if ! [[ -z "$TMUX_MAN_PANE" ]] && [[ $? ]]; then
echo luck
tmux -q respawn-pane -k -t $TMUX_MAN_PANE man $1
else
echo fuck
tmux split-window -vf man $1
TMUX_MAN_PANE=$(tmux display-message -p "#pane_id")
export TMUX_MAN_PANE
tmux select-pane -t last
fi
fi
UPDATE 2: Success
Finally figured it out. Was having problems getting the status of the first line in the if statement. Had to do some trickery to get the output of the tmux statement in the first line of the if statement. If anyone knows a cleaner way to do this, I'm all ears.
Here's the working code:
tmux_man_page()
if [[ "$TERM" =~ 'screen' ]] && [[ -n "$TMUX" ]]; then
fucker=$(tmux list-panes -t $TMUX_MAN_PANE 2>&1)
if ! [[ -z "$TMUX_MAN_PANE" ]] && ! [[ $fucker =~ 'find pane' ]]; then
tmux -q respawn-pane -k -t $TMUX_MAN_PANE man $1
else
tmux split-window -vf man $1
TMUX_MAN_PANE=$(tmux display-message -p "#pane_id")
export TMUX_MAN_PANE
tmux select-pane -t last
fi
fi
tmux_man_page_close()
if [ $TMUX_MAN_PANE ]; then
tmux kill-pane -t $TMUX_MAN_PANE
fi
bash
edited 4 hours ago
Rui F Ribeiro
42k1483142
asked 7 hours ago
StevieDStevieD
1709
add a comment |
This:
$ echo $VAR
something
And this:
$ [[ -z "$VAR" ]]
$ echo $?
1
Yet this:
if [[ -z "$TMUX_MAN_PANE" ]]; then
echo 'NEVER PRINTS!'
This screws with my head.
UPDATE
Here's some real code. I can't get this to work.
tmux_man_page()
if [[ "$TERM" =~ 'screen' ]] && [[ -n "$TMUX" ]]; then
tmux list-panes -t $TMUX_MAN_PANE &> /dev/null
echo $?
echo $TMUX_MAN_PANE
[[ -z "$TMUX_MAN_PANE" ]]
echo $?
if ! [[ -z "$TMUX_MAN_PANE" ]] && [[ $? ]]; then
echo luck
tmux -q respawn-pane -k -t $TMUX_MAN_PANE man $1
else
echo fuck
tmux split-window -vf man $1
TMUX_MAN_PANE=$(tmux display-message -p "#pane_id")
export TMUX_MAN_PANE
tmux select-pane -t last
fi
fi
UPDATE 2: Success
Finally figured it out. Was having problems getting the status of the first line in the if statement. Had to do some trickery to get the output of the tmux statement in the first line of the if statement. If anyone knows a cleaner way to do this, I'm all ears.
Here's the working code:
tmux_man_page()
if [[ "$TERM" =~ 'screen' ]] && [[ -n "$TMUX" ]]; then
fucker=$(tmux list-panes -t $TMUX_MAN_PANE 2>&1)
if ! [[ -z "$TMUX_MAN_PANE" ]] && ! [[ $fucker =~ 'find pane' ]]; then
tmux -q respawn-pane -k -t $TMUX_MAN_PANE man $1
else
tmux split-window -vf man $1
TMUX_MAN_PANE=$(tmux display-message -p "#pane_id")
export TMUX_MAN_PANE
tmux select-pane -t last
fi
fi
tmux_man_page_close()
if [ $TMUX_MAN_PANE ]; then
tmux kill-pane -t $TMUX_MAN_PANE
fi
bash
edited 4 hours ago
Rui F Ribeiro
42k1483142
asked 7 hours ago
StevieDStevieD
1709
2
Your update does not include enough information. Please (a) include the values ofTERM,TMUX, andTMUX_MAN_PANEfrom before the function runs and (b) include the output of the function and then (c) explain how that output differs from what you expect.
– John1024
6 hours ago
It's all a mess. In the first line of the if statement, I just want to know if that command is throwing an error. There is no seemingly rational way to do that. I don't want the output from the command, I want to know if it's throwing an error. That's it.
– StevieD
6 hours ago
It's showing the command was a success even though it can't find the pane. I see no way to extract the output from that tmux command.
– StevieD
6 hours ago
I should just be going this in perl. Fuck this crazy shit.
– StevieD
6 hours ago
Jesus, finally figured it out. Posting solution.
– StevieD
6 hours ago
add a comment |
This:
$ echo $VAR
something
And this:
$ [[ -z "$VAR" ]]
$ echo $?
1
Yet this:
if [[ -z "$TMUX_MAN_PANE" ]]; then
echo 'NEVER PRINTS!'
This screws with my head.
UPDATE
Here's some real code. I can't get this to work.
tmux_man_page()
if [[ "$TERM" =~ 'screen' ]] && [[ -n "$TMUX" ]]; then
tmux list-panes -t $TMUX_MAN_PANE &> /dev/null
echo $?
echo $TMUX_MAN_PANE
[[ -z "$TMUX_MAN_PANE" ]]
echo $?
if ! [[ -z "$TMUX_MAN_PANE" ]] && [[ $? ]]; then
echo luck
tmux -q respawn-pane -k -t $TMUX_MAN_PANE man $1
else
echo fuck
tmux split-window -vf man $1
TMUX_MAN_PANE=$(tmux display-message -p "#pane_id")
export TMUX_MAN_PANE
tmux select-pane -t last
fi
fi
UPDATE 2: Success
Finally figured it out. Was having problems getting the status of the first line in the if statement. Had to do some trickery to get the output of the tmux statement in the first line of the if statement. If anyone knows a cleaner way to do this, I'm all ears.
Here's the working code:
tmux_man_page()
if [[ "$TERM" =~ 'screen' ]] && [[ -n "$TMUX" ]]; then
fucker=$(tmux list-panes -t $TMUX_MAN_PANE 2>&1)
if ! [[ -z "$TMUX_MAN_PANE" ]] && ! [[ $fucker =~ 'find pane' ]]; then
tmux -q respawn-pane -k -t $TMUX_MAN_PANE man $1
else
tmux split-window -vf man $1
TMUX_MAN_PANE=$(tmux display-message -p "#pane_id")
export TMUX_MAN_PANE
tmux select-pane -t last
fi
fi
tmux_man_page_close()
if [ $TMUX_MAN_PANE ]; then
tmux kill-pane -t $TMUX_MAN_PANE
fi
bash
edited 4 hours ago
Rui F Ribeiro
42k1483142
asked 7 hours ago
StevieDStevieD
1709
This:
$ echo $VAR
something
And this:
$ [[ -z "$VAR" ]]
$ echo $?
1
Yet this:
if [[ -z "$TMUX_MAN_PANE" ]]; then
echo 'NEVER PRINTS!'
This screws with my head.
UPDATE
Here's some real code. I can't get this to work.
tmux_man_page()
if [[ "$TERM" =~ 'screen' ]] && [[ -n "$TMUX" ]]; then
tmux list-panes -t $TMUX_MAN_PANE &> /dev/null
echo $?
echo $TMUX_MAN_PANE
[[ -z "$TMUX_MAN_PANE" ]]
echo $?
if ! [[ -z "$TMUX_MAN_PANE" ]] && [[ $? ]]; then
echo luck
tmux -q respawn-pane -k -t $TMUX_MAN_PANE man $1
else
echo fuck
tmux split-window -vf man $1
TMUX_MAN_PANE=$(tmux display-message -p "#pane_id")
export TMUX_MAN_PANE
tmux select-pane -t last
fi
fi
UPDATE 2: Success
Finally figured it out. Was having problems getting the status of the first line in the if statement. Had to do some trickery to get the output of the tmux statement in the first line of the if statement. If anyone knows a cleaner way to do this, I'm all ears.
Here's the working code:
tmux_man_page()
if [[ "$TERM" =~ 'screen' ]] && [[ -n "$TMUX" ]]; then
fucker=$(tmux list-panes -t $TMUX_MAN_PANE 2>&1)
if ! [[ -z "$TMUX_MAN_PANE" ]] && ! [[ $fucker =~ 'find pane' ]]; then
tmux -q respawn-pane -k -t $TMUX_MAN_PANE man $1
else
tmux split-window -vf man $1
TMUX_MAN_PANE=$(tmux display-message -p "#pane_id")
export TMUX_MAN_PANE
tmux select-pane -t last
fi
fi
tmux_man_page_close()
if [ $TMUX_MAN_PANE ]; then
tmux kill-pane -t $TMUX_MAN_PANE
fi
bash
bash
edited 4 hours ago
Rui F Ribeiro
42k1483142
asked 7 hours ago
StevieDStevieD
1709
edited 4 hours ago
Rui F Ribeiro
42k1483142
asked 7 hours ago
StevieDStevieD
1709
edited 4 hours ago
Rui F Ribeiro
42k1483142
edited 4 hours ago
Rui F Ribeiro
42k1483142
edited 4 hours ago
Rui F Ribeiro
42k1483142
42k1483142
asked 7 hours ago
StevieDStevieD
1709
asked 7 hours ago
StevieDStevieD
1709
asked 7 hours ago
StevieDStevieD
1709
1709
2
Your update does not include enough information. Please (a) include the values ofTERM,TMUX, andTMUX_MAN_PANEfrom before the function runs and (b) include the output of the function and then (c) explain how that output differs from what you expect.
– John1024
6 hours ago
It's all a mess. In the first line of the if statement, I just want to know if that command is throwing an error. There is no seemingly rational way to do that. I don't want the output from the command, I want to know if it's throwing an error. That's it.
– StevieD
6 hours ago
It's showing the command was a success even though it can't find the pane. I see no way to extract the output from that tmux command.
– StevieD
6 hours ago
I should just be going this in perl. Fuck this crazy shit.
– StevieD
6 hours ago
Jesus, finally figured it out. Posting solution.
– StevieD
6 hours ago
add a comment |
2
Your update does not include enough information. Please (a) include the values ofTERM,TMUX, andTMUX_MAN_PANEfrom before the function runs and (b) include the output of the function and then (c) explain how that output differs from what you expect.
– John1024
6 hours ago
It's all a mess. In the first line of the if statement, I just want to know if that command is throwing an error. There is no seemingly rational way to do that. I don't want the output from the command, I want to know if it's throwing an error. That's it.
– StevieD
6 hours ago
It's showing the command was a success even though it can't find the pane. I see no way to extract the output from that tmux command.
– StevieD
6 hours ago
I should just be going this in perl. Fuck this crazy shit.
– StevieD
6 hours ago
Jesus, finally figured it out. Posting solution.
– StevieD
6 hours ago
2
2
Your update does not include enough information. Please (a) include the values of
TERM, TMUX, and TMUX_MAN_PANE from before the function runs and (b) include the output of the function and then (c) explain how that output differs from what you expect.– John1024
6 hours ago
Your update does not include enough information. Please (a) include the values of
TERM, TMUX, and TMUX_MAN_PANE from before the function runs and (b) include the output of the function and then (c) explain how that output differs from what you expect.– John1024
6 hours ago
It's all a mess. In the first line of the if statement, I just want to know if that command is throwing an error. There is no seemingly rational way to do that. I don't want the output from the command, I want to know if it's throwing an error. That's it.
– StevieD
6 hours ago
It's all a mess. In the first line of the if statement, I just want to know if that command is throwing an error. There is no seemingly rational way to do that. I don't want the output from the command, I want to know if it's throwing an error. That's it.
– StevieD
6 hours ago
It's showing the command was a success even though it can't find the pane. I see no way to extract the output from that tmux command.
– StevieD
6 hours ago
It's showing the command was a success even though it can't find the pane. I see no way to extract the output from that tmux command.
– StevieD
6 hours ago
I should just be going this in perl. Fuck this crazy shit.
– StevieD
6 hours ago
I should just be going this in perl. Fuck this crazy shit.
– StevieD
6 hours ago
Jesus, finally figured it out. Posting solution.
– StevieD
6 hours ago
Jesus, finally figured it out. Posting solution.
– StevieD
6 hours ago
add a comment |
1 Answer
1
active
oldest
votes
The key is that 0 means true and 1 (or any other non-zero value) means false.
In shell, a test that is true (or a program which completes successfully), exits with code 0. The test [[ -z "$VAR" ]] returns code zero (true) if $VAR is empty or one (false) if it is not empty:
$ var=""; [[ -z "$var" ]]; echo $?
0
$ var="NOT EMPTY"; [[ -z "$var" ]]; echo $?
1
In sum, if $VAR is non-empty, then [[ -z "$VAR" ]] is false (returns 1) and the then statement does not execute.
Did you intend for the test to return true if the variable was non-empty? If so, replace -z with -n:
$ var=""; [[ -n "$var" ]]; echo $?
1
$ var="NOT EMPTY"; [[ -n "$var" ]]; echo $?
0
For brevity, the same test is performed if -n is omitted:
$ var=""; [[ "$var" ]]; echo $?
1
$ var="NOT EMPTY"; [[ "$var" ]]; echo $?
0
answered 6 hours ago
John1024John1024
48.4k5113128
I just posted my real code. I cannot, for the life of me, get that to work. I'm literally going fucking nuts.
– StevieD
6 hours ago
1
@StevieD Runset -xand then run your code. This will show you how every step is evaluated.
– John1024
6 hours ago
Ah, shit. Forgot about that setting. I'll try it.
– StevieD
6 hours ago
add a comment |
Your Answer
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
The key is that 0 means true and 1 (or any other non-zero value) means false.
In shell, a test that is true (or a program which completes successfully), exits with code 0. The test [[ -z "$VAR" ]] returns code zero (true) if $VAR is empty or one (false) if it is not empty:
$ var=""; [[ -z "$var" ]]; echo $?
0
$ var="NOT EMPTY"; [[ -z "$var" ]]; echo $?
1
In sum, if $VAR is non-empty, then [[ -z "$VAR" ]] is false (returns 1) and the then statement does not execute.
Did you intend for the test to return true if the variable was non-empty? If so, replace -z with -n:
$ var=""; [[ -n "$var" ]]; echo $?
1
$ var="NOT EMPTY"; [[ -n "$var" ]]; echo $?
0
For brevity, the same test is performed if -n is omitted:
$ var=""; [[ "$var" ]]; echo $?
1
$ var="NOT EMPTY"; [[ "$var" ]]; echo $?
0
answered 6 hours ago
John1024John1024
48.4k5113128
I just posted my real code. I cannot, for the life of me, get that to work. I'm literally going fucking nuts.
– StevieD
6 hours ago
1
@StevieD Runset -xand then run your code. This will show you how every step is evaluated.
– John1024
6 hours ago
Ah, shit. Forgot about that setting. I'll try it.
– StevieD
6 hours ago
add a comment |
The key is that 0 means true and 1 (or any other non-zero value) means false.
In shell, a test that is true (or a program which completes successfully), exits with code 0. The test [[ -z "$VAR" ]] returns code zero (true) if $VAR is empty or one (false) if it is not empty:
$ var=""; [[ -z "$var" ]]; echo $?
0
$ var="NOT EMPTY"; [[ -z "$var" ]]; echo $?
1
In sum, if $VAR is non-empty, then [[ -z "$VAR" ]] is false (returns 1) and the then statement does not execute.
Did you intend for the test to return true if the variable was non-empty? If so, replace -z with -n:
$ var=""; [[ -n "$var" ]]; echo $?
1
$ var="NOT EMPTY"; [[ -n "$var" ]]; echo $?
0
For brevity, the same test is performed if -n is omitted:
$ var=""; [[ "$var" ]]; echo $?
1
$ var="NOT EMPTY"; [[ "$var" ]]; echo $?
0
answered 6 hours ago
John1024John1024
48.4k5113128
I just posted my real code. I cannot, for the life of me, get that to work. I'm literally going fucking nuts.
– StevieD
6 hours ago
1
@StevieD Runset -xand then run your code. This will show you how every step is evaluated.
– John1024
6 hours ago
Ah, shit. Forgot about that setting. I'll try it.
– StevieD
6 hours ago
add a comment |
The key is that 0 means true and 1 (or any other non-zero value) means false.
In shell, a test that is true (or a program which completes successfully), exits with code 0. The test [[ -z "$VAR" ]] returns code zero (true) if $VAR is empty or one (false) if it is not empty:
$ var=""; [[ -z "$var" ]]; echo $?
0
$ var="NOT EMPTY"; [[ -z "$var" ]]; echo $?
1
In sum, if $VAR is non-empty, then [[ -z "$VAR" ]] is false (returns 1) and the then statement does not execute.
Did you intend for the test to return true if the variable was non-empty? If so, replace -z with -n:
$ var=""; [[ -n "$var" ]]; echo $?
1
$ var="NOT EMPTY"; [[ -n "$var" ]]; echo $?
0
For brevity, the same test is performed if -n is omitted:
$ var=""; [[ "$var" ]]; echo $?
1
$ var="NOT EMPTY"; [[ "$var" ]]; echo $?
0
answered 6 hours ago
John1024John1024
48.4k5113128
The key is that 0 means true and 1 (or any other non-zero value) means false.
In shell, a test that is true (or a program which completes successfully), exits with code 0. The test [[ -z "$VAR" ]] returns code zero (true) if $VAR is empty or one (false) if it is not empty:
$ var=""; [[ -z "$var" ]]; echo $?
0
$ var="NOT EMPTY"; [[ -z "$var" ]]; echo $?
1
In sum, if $VAR is non-empty, then [[ -z "$VAR" ]] is false (returns 1) and the then statement does not execute.
Did you intend for the test to return true if the variable was non-empty? If so, replace -z with -n:
$ var=""; [[ -n "$var" ]]; echo $?
1
$ var="NOT EMPTY"; [[ -n "$var" ]]; echo $?
0
For brevity, the same test is performed if -n is omitted:
$ var=""; [[ "$var" ]]; echo $?
1
$ var="NOT EMPTY"; [[ "$var" ]]; echo $?
0
answered 6 hours ago
John1024John1024
48.4k5113128
edited 6 hours ago
answered 6 hours ago
John1024John1024
48.4k5113128
answered 6 hours ago
John1024John1024
48.4k5113128
answered 6 hours ago
John1024John1024
48.4k5113128
48.4k5113128
I just posted my real code. I cannot, for the life of me, get that to work. I'm literally going fucking nuts.
– StevieD
6 hours ago
1
@StevieD Runset -xand then run your code. This will show you how every step is evaluated.
– John1024
6 hours ago
Ah, shit. Forgot about that setting. I'll try it.
– StevieD
6 hours ago
add a comment |
I just posted my real code. I cannot, for the life of me, get that to work. I'm literally going fucking nuts.
– StevieD
6 hours ago
1
@StevieD Runset -xand then run your code. This will show you how every step is evaluated.
– John1024
6 hours ago
Ah, shit. Forgot about that setting. I'll try it.
– StevieD
6 hours ago
I just posted my real code. I cannot, for the life of me, get that to work. I'm literally going fucking nuts.
– StevieD
6 hours ago
I just posted my real code. I cannot, for the life of me, get that to work. I'm literally going fucking nuts.
– StevieD
6 hours ago
1
1
@StevieD Run
set -x and then run your code. This will show you how every step is evaluated.– John1024
6 hours ago
@StevieD Run
set -x and then run your code. This will show you how every step is evaluated.– John1024
6 hours ago
Ah, shit. Forgot about that setting. I'll try it.
– StevieD
6 hours ago
Ah, shit. Forgot about that setting. I'll try it.
– StevieD
6 hours ago
add a comment |
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2
Your update does not include enough information. Please (a) include the values of
TERM,TMUX, andTMUX_MAN_PANEfrom before the function runs and (b) include the output of the function and then (c) explain how that output differs from what you expect.– John1024
6 hours ago
It's all a mess. In the first line of the if statement, I just want to know if that command is throwing an error. There is no seemingly rational way to do that. I don't want the output from the command, I want to know if it's throwing an error. That's it.
– StevieD
6 hours ago
It's showing the command was a success even though it can't find the pane. I see no way to extract the output from that tmux command.
– StevieD
6 hours ago
I should just be going this in perl. Fuck this crazy shit.
– StevieD
6 hours ago
Jesus, finally figured it out. Posting solution.
– StevieD
6 hours ago