Catch failure in shell script
You can use the exit status of the command explicitly in the test:
if ! unzip myfile.zip &> /dev/null; then
# handle error
fi
You can use $?
. It returns:
- 0 if the command was successfully executed.
- !0 if the command was unsuccessful.
So you can do
#!/bin/bash
unzip myfile.zip
if [ "$?" -eq 0 ]; then
#do stuff on unzip successful
fi
Test
$ cat a
hello
$ echo $?
0
$ cat b
cat: b: No such file or directory
$ echo $?
1
The variable $?
contains the exit status of the previous command. A successful exit status for (most) commands is (usually) 0, so just check for that...
#!/bin/bash
unzip myfile.zip
if [ $? == 0 ]
then
# Do something
fi