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Bash - Shebang, Hebang and Webang Command + Subshell
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#!/bin/bash | |
FIRST_COMMAND= | |
OTHER_COMMANDS= | |
BANG_LINE= | |
main() | |
{ | |
for arg in "$@" | |
do | |
if [ "$FIRST_COMMAND" = "" ]; then | |
FIRST_COMMAND=$arg | |
else | |
if [ "$OTHER_COMMANDS" = "" ]; then | |
OTHER_COMMANDS=$arg | |
else | |
OTHER_COMMANDS="$OTHER_COMMANDS $arg" | |
fi | |
fi | |
done | |
if [ -f $FIRST_COMMAND ]; then | |
check_and_expand_bang_line | |
if [[ "$BANG_LINE" != "" ]]; then | |
eval "$BANG_LINE $OTHER_COMMANDS" | |
else | |
system_exec | |
fi | |
else | |
system_exec | |
fi | |
} | |
check_and_expand_bang_line() | |
{ | |
read -r first_line<$FIRST_COMMAND | |
if [[ $first_line == \#!* ]]; then | |
BANG_LINE=${first_line:2} | |
BANG_LINE=${BANG_LINE/\{0\}/$(readlink -e $FIRST_COMMAND)} | |
elif [[ $first_line == //!* ]]; then | |
BANG_LINE=${first_line:3} | |
BANG_LINE=${BANG_LINE/\{0\}/$(readlink -e $FIRST_COMMAND)} | |
elif [[ $first_line == /\*!* ]]; then | |
BANG_LINE=${first_line:3:-2} | |
BANG_LINE=${BANG_LINE/\{0\}/$(readlink -e $FIRST_COMMAND)} | |
fi | |
} | |
system_exec() | |
{ | |
eval "$FIRST_COMMAND $OTHER_COMMANDS" | |
} | |
main $* |
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