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How to make an `if cond success failure` function in bash script
script to send e-mail for success or failurebash script - loop functionCheck command success in bashCombining two variables mangles them on WindowsHow to execute different commands based on success / failure of previous command in shell script?Set comparator with variables within a variable, then have shell expand those variables each time it's echo'dHow to make a customized function in bash fileForward-slash-enclosed Bash script function name(?)Conditional emoji on terminal success and failureTrying to understand the syntax for echo $(($1 * 2))
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;
I am getting close with this:
myif()
if ([ $1 ]) then
shift
$*
true
else
shift
shift
$*
false
fi
The main part is that if ([ $1 ]) then is not correct. I would like to be able to do these 3 things:
# boolean literals, probably passed in as the output to variables.
myif true successhandler failurehandler
myif false successhandler failurehandler
# a function to be evaluated
myif checkcondition successhandler failurehandler
checkcondition()
true
# or:
# false, to test
The following works to check a file:
file_exists()
if ([ -e $1 ]) then
shift
$*
true
else
shift
shift
$*
false
fi
Wondering how to get the first example working where it handles those 3 cases. I've also tried using eval and doing this:
myif()
if ([ "$*" ]) then
shift
$*
true
else
shift
shift
$*
false
fi
But no go.
bash shell-script
asked Mar 27 at 15:45
Lance PollardLance Pollard
1717
add a comment |
I am getting close with this:
myif()
if ([ $1 ]) then
shift
$*
true
else
shift
shift
$*
false
fi
The main part is that if ([ $1 ]) then is not correct. I would like to be able to do these 3 things:
# boolean literals, probably passed in as the output to variables.
myif true successhandler failurehandler
myif false successhandler failurehandler
# a function to be evaluated
myif checkcondition successhandler failurehandler
checkcondition()
true
# or:
# false, to test
The following works to check a file:
file_exists()
if ([ -e $1 ]) then
shift
$*
true
else
shift
shift
$*
false
fi
Wondering how to get the first example working where it handles those 3 cases. I've also tried using eval and doing this:
myif()
if ([ "$*" ]) then
shift
$*
true
else
shift
shift
$*
false
fi
But no go.
bash shell-script
asked Mar 27 at 15:45
Lance PollardLance Pollard
1717
You can use que expression[ cond ] && success || failure
– Juan
Mar 27 at 16:56
add a comment |
I am getting close with this:
myif()
if ([ $1 ]) then
shift
$*
true
else
shift
shift
$*
false
fi
The main part is that if ([ $1 ]) then is not correct. I would like to be able to do these 3 things:
# boolean literals, probably passed in as the output to variables.
myif true successhandler failurehandler
myif false successhandler failurehandler
# a function to be evaluated
myif checkcondition successhandler failurehandler
checkcondition()
true
# or:
# false, to test
The following works to check a file:
file_exists()
if ([ -e $1 ]) then
shift
$*
true
else
shift
shift
$*
false
fi
Wondering how to get the first example working where it handles those 3 cases. I've also tried using eval and doing this:
myif()
if ([ "$*" ]) then
shift
$*
true
else
shift
shift
$*
false
fi
But no go.
bash shell-script
asked Mar 27 at 15:45
Lance PollardLance Pollard
1717
I am getting close with this:
myif()
if ([ $1 ]) then
shift
$*
true
else
shift
shift
$*
false
fi
The main part is that if ([ $1 ]) then is not correct. I would like to be able to do these 3 things:
# boolean literals, probably passed in as the output to variables.
myif true successhandler failurehandler
myif false successhandler failurehandler
# a function to be evaluated
myif checkcondition successhandler failurehandler
checkcondition()
true
# or:
# false, to test
The following works to check a file:
file_exists()
if ([ -e $1 ]) then
shift
$*
true
else
shift
shift
$*
false
fi
Wondering how to get the first example working where it handles those 3 cases. I've also tried using eval and doing this:
myif()
if ([ "$*" ]) then
shift
$*
true
else
shift
shift
$*
false
fi
But no go.
bash shell-script
bash shell-script
asked Mar 27 at 15:45
Lance PollardLance Pollard
1717
asked Mar 27 at 15:45
Lance PollardLance Pollard
1717
asked Mar 27 at 15:45
Lance PollardLance Pollard
1717
asked Mar 27 at 15:45
Lance PollardLance Pollard
1717
asked Mar 27 at 15:45
Lance PollardLance Pollard
1717
1717
You can use que expression[ cond ] && success || failure
– Juan
Mar 27 at 16:56
add a comment |
You can use que expression[ cond ] && success || failure
– Juan
Mar 27 at 16:56
You can use que expression
[ cond ] && success || failure– Juan
Mar 27 at 16:56
You can use que expression
[ cond ] && success || failure– Juan
Mar 27 at 16:56
add a comment |
1 Answer
1
active
oldest
votes
It looks like you want to execute $1, and based on its success or failure, execute $2 or $3. Here's one way to do it:
successhandler()
echo GREAT SUCCESS
failurehandler()
echo sad failure
checkcondition()
if (( RANDOM < 15000 ))
then
true
else
false
fi
myif()
# disable filename generation (in case globs are present)
set -f
if $1 > /dev/null 2>&1
then
$2
true
else
$3
false
fi
Here I've created arbitrary versions of successhandler, failurehandler, and checkcondition to demonstrate the behavior.
Here are some sample runs:
$ myif true successhandler failurehandler
GREAT SUCCESS
$ myif false successhandler failurehandler
sad failure
$ myif 'test -f /etc/hosts' successhandler failurehandler
GREAT SUCCESS
$ myif 'test -f /etc/hosts/not/there' successhandler failurehandler
sad failure
$ myif checkcondition successhandler failurehandler
GREAT SUCCESS
$ myif checkcondition successhandler failurehandler
sad failure
$ myif checkcondition successhandler failurehandler
GREAT SUCCESS
$ myif checkcondition successhandler failurehandler
sad failure
$ myif checkcondition successhandler failurehandler
sad failure
Inside myif(), I specifically drop stdout and stderr to /dev/null; adjust that as you prefer.
answered Mar 27 at 16:47
Jeff Schaller♦Jeff Schaller
44.7k1163145
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
It looks like you want to execute $1, and based on its success or failure, execute $2 or $3. Here's one way to do it:
successhandler()
echo GREAT SUCCESS
failurehandler()
echo sad failure
checkcondition()
if (( RANDOM < 15000 ))
then
true
else
false
fi
myif()
# disable filename generation (in case globs are present)
set -f
if $1 > /dev/null 2>&1
then
$2
true
else
$3
false
fi
Here I've created arbitrary versions of successhandler, failurehandler, and checkcondition to demonstrate the behavior.
Here are some sample runs:
$ myif true successhandler failurehandler
GREAT SUCCESS
$ myif false successhandler failurehandler
sad failure
$ myif 'test -f /etc/hosts' successhandler failurehandler
GREAT SUCCESS
$ myif 'test -f /etc/hosts/not/there' successhandler failurehandler
sad failure
$ myif checkcondition successhandler failurehandler
GREAT SUCCESS
$ myif checkcondition successhandler failurehandler
sad failure
$ myif checkcondition successhandler failurehandler
GREAT SUCCESS
$ myif checkcondition successhandler failurehandler
sad failure
$ myif checkcondition successhandler failurehandler
sad failure
Inside myif(), I specifically drop stdout and stderr to /dev/null; adjust that as you prefer.
answered Mar 27 at 16:47
Jeff Schaller♦Jeff Schaller
44.7k1163145
add a comment |
It looks like you want to execute $1, and based on its success or failure, execute $2 or $3. Here's one way to do it:
successhandler()
echo GREAT SUCCESS
failurehandler()
echo sad failure
checkcondition()
if (( RANDOM < 15000 ))
then
true
else
false
fi
myif()
# disable filename generation (in case globs are present)
set -f
if $1 > /dev/null 2>&1
then
$2
true
else
$3
false
fi
Here I've created arbitrary versions of successhandler, failurehandler, and checkcondition to demonstrate the behavior.
Here are some sample runs:
$ myif true successhandler failurehandler
GREAT SUCCESS
$ myif false successhandler failurehandler
sad failure
$ myif 'test -f /etc/hosts' successhandler failurehandler
GREAT SUCCESS
$ myif 'test -f /etc/hosts/not/there' successhandler failurehandler
sad failure
$ myif checkcondition successhandler failurehandler
GREAT SUCCESS
$ myif checkcondition successhandler failurehandler
sad failure
$ myif checkcondition successhandler failurehandler
GREAT SUCCESS
$ myif checkcondition successhandler failurehandler
sad failure
$ myif checkcondition successhandler failurehandler
sad failure
Inside myif(), I specifically drop stdout and stderr to /dev/null; adjust that as you prefer.
answered Mar 27 at 16:47
Jeff Schaller♦Jeff Schaller
44.7k1163145
add a comment |
It looks like you want to execute $1, and based on its success or failure, execute $2 or $3. Here's one way to do it:
successhandler()
echo GREAT SUCCESS
failurehandler()
echo sad failure
checkcondition()
if (( RANDOM < 15000 ))
then
true
else
false
fi
myif()
# disable filename generation (in case globs are present)
set -f
if $1 > /dev/null 2>&1
then
$2
true
else
$3
false
fi
Here I've created arbitrary versions of successhandler, failurehandler, and checkcondition to demonstrate the behavior.
Here are some sample runs:
$ myif true successhandler failurehandler
GREAT SUCCESS
$ myif false successhandler failurehandler
sad failure
$ myif 'test -f /etc/hosts' successhandler failurehandler
GREAT SUCCESS
$ myif 'test -f /etc/hosts/not/there' successhandler failurehandler
sad failure
$ myif checkcondition successhandler failurehandler
GREAT SUCCESS
$ myif checkcondition successhandler failurehandler
sad failure
$ myif checkcondition successhandler failurehandler
GREAT SUCCESS
$ myif checkcondition successhandler failurehandler
sad failure
$ myif checkcondition successhandler failurehandler
sad failure
Inside myif(), I specifically drop stdout and stderr to /dev/null; adjust that as you prefer.
answered Mar 27 at 16:47
Jeff Schaller♦Jeff Schaller
44.7k1163145
It looks like you want to execute $1, and based on its success or failure, execute $2 or $3. Here's one way to do it:
successhandler()
echo GREAT SUCCESS
failurehandler()
echo sad failure
checkcondition()
if (( RANDOM < 15000 ))
then
true
else
false
fi
myif()
# disable filename generation (in case globs are present)
set -f
if $1 > /dev/null 2>&1
then
$2
true
else
$3
false
fi
Here I've created arbitrary versions of successhandler, failurehandler, and checkcondition to demonstrate the behavior.
Here are some sample runs:
$ myif true successhandler failurehandler
GREAT SUCCESS
$ myif false successhandler failurehandler
sad failure
$ myif 'test -f /etc/hosts' successhandler failurehandler
GREAT SUCCESS
$ myif 'test -f /etc/hosts/not/there' successhandler failurehandler
sad failure
$ myif checkcondition successhandler failurehandler
GREAT SUCCESS
$ myif checkcondition successhandler failurehandler
sad failure
$ myif checkcondition successhandler failurehandler
GREAT SUCCESS
$ myif checkcondition successhandler failurehandler
sad failure
$ myif checkcondition successhandler failurehandler
sad failure
Inside myif(), I specifically drop stdout and stderr to /dev/null; adjust that as you prefer.
answered Mar 27 at 16:47
Jeff Schaller♦Jeff Schaller
44.7k1163145
answered Mar 27 at 16:47
Jeff Schaller♦Jeff Schaller
44.7k1163145
answered Mar 27 at 16:47
Jeff Schaller♦Jeff Schaller
44.7k1163145
answered Mar 27 at 16:47
Jeff Schaller♦Jeff Schaller
44.7k1163145
44.7k1163145
add a comment |
add a comment |
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-bash, shell-script
You can use que expression
[ cond ] && success || failure– Juan
Mar 27 at 16:56