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So I want to set some paths differently depending on the host, but unfortunately it's not working. Here is my script:
if [$HOSTNAME == "foo"]; then echo "success" else echo "failure" fi This is what happens:
-bash: [foo: command not found failure I know for certain that $HOSTNAME is foo, so I'm not sure what the problem is. I am pretty new to bash though. Any help would be appreciated! Thanks!
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$? is the exit status of the most recently-executed command; by convention, 0 means success and anything else indicates failure. That line is testing whether the grep command succeeded. The grep manpage states: The exit status is 0 if selected lines are found, and 1 if not found.
== is a bash-specific alias for = and it performs a string (lexical) comparison instead of a numeric comparison.
One can check if a directory exists in a Linux shell script using the following syntax: [ -d "/path/dir/" ] && echo "Directory /path/dir/ exists."
The POSIX and portable way to compare strings in the shell is
if [ "$HOSTNAME" = foo ]; then printf '%s\n' "on the right host" else printf '%s\n' "uh-oh, not on foo" fi A case statement may be more flexible, though:
case $HOSTNAME in (foo) echo "Woohoo, we're on foo!";; (bar) echo "Oops, bar? Are you kidding?";; (*) echo "How did I get in the middle of nowhere?";; esac 
#!/bin/bash if [[ $(hostname) == "home" ]] || [[ $(hostname) == "home2" ]]; then echo "True" fi If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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