Others have correctly posted that you can use $? to get the most recent exit code: wget_output=$(wget -q “$URL”) if [ $? -ne 0 ]; then … This lets you capture both the stdout and the exit code. If you don’t actually care what it prints, you can just test it directly: if wget -q … Read more
You’d really need to use a shell function in order to accomplish that. For a simple script like that it should be pretty easy to have it working in both zsh and bash. Just place the following in a file: my_notify() { echo “exit code: $?” echo “PPID: $PPID” } Then source that file from … Read more
I recently switched from canopy to Anaconda precisely to get away from having to activate an env in cron jobs. Anaconda makes this very simple, based on the PATH enviornment variable. (I’m using miniconda not the full Anaconds install but I believe anaconda should work the same way) There are two different approaches, I’ve tested; … Read more
Maybe the output goes to stderr, not stdout? Try this: OUTPUT=”$(sudo apache2ctl configtest 2>&1)”
#!/bin/bash trap ‘echo “Caught SIGUSR1″‘ SIGUSR1 echo “Sleeping. Pid=$$” while : do sleep 10 & wait $! echo “Sleep over” done
Just negate the greater than test: if [[ ! “a” > “b” ]]
On UNIX-like systems, you should always start scripts with a shebang line. The system call execve (which is responsible for starting programs) relies on an executable having either an executable header or a shebang line. From FreeBSD’s execve manual page: The execve() system call transforms the calling process into a new process. The new process … Read more
you can do “slicing” as well, $@ gets all the arguments in bash. echo “${@:2}” gets 2nd argument onwards eg $ cat shell.sh #!/bin/bash echo “${@:2}” $ ./shell.sh 1 2 3 4 2 3 4
This is what I’ve just googled and I remember myself using this some time ago… Use exec to redirect both standard output and standard error of all commands in a script: #!/bin/bash logfile=$$.log exec > $logfile 2>&1 For more redirection magic check out Advanced Bash Scripting Guide – I/O Redirection. If you also want to … Read more