${1:?} bash
bar=${1:?First argument missing}
# It exits with code 1 the non-interactive shell if argument 1
# does not exist and prints the message to sterr.${1:?} bash
bar=${1:?First argument missing}
# It exits with code 1 the non-interactive shell if argument 1
# does not exist and prints the message to sterr.bash $! command
# $! command shows the PID of the last process started on your shell sessionCopyright © 2021 Codeinu
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