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In perl, you can exit with an error msg with die "some msg". Is there an equivalent single command in bash? Right now, I'm achieving this using commands: echo "some msg" && exit 1
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$1 means an input argument and -z means non-defined or empty. You're testing whether an input argument to the script was defined when running the script. Follow this answer to receive notifications.
bash [filename] runs the commands saved in a file. $@ refers to all of a shell script's command-line arguments. $1 , $2 , etc., refer to the first command-line argument, the second command-line argument, etc. Place variables in quotes if the values might have spaces in them.
by Aqsa Yasin. Set –e is used within the Bash to stop execution instantly as a query exits while having a non-zero status.
$# is the number of positional parameters passed to the script, shell, or shell function. This is because, while a shell function is running, the positional parameters are temporarily replaced with the arguments to the function. This lets functions accept and use their own positional parameters.
You can roll your own easily enough:
die() { echo "$*" 1>&2 ; exit 1; } ... die "Kaboom" Here's what I'm using. It's too small to put in a library so I must have typed it hundreds of times ...
warn () { echo "$0:" "$@" >&2 } die () { rc=$1 shift warn "$@" exit $rc } Usage: die 127 "Syntax error"
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