Shebang line limit in bash and linux kernel
If you don't want to recompile your kernel to get longer shebang lines, you could write a wrapper:
#!/bin/bash
if [[ $# -eq 0 ]]; then
echo "usage: ${0##*/} script [args ...]"
exit
fi
# we're going to expand a variable *unquoted* to use word splitting, but
# we don't want to have path expansion effects, so turn that off
set -f
shebang=$(head -1 "$1")
if [[ $shebang == '#!'* ]]; then
interp=( ${shebang#\#!} ) # use an array in case a argument is there too
else
interp=( /bin/sh )
fi
# now run it
exec "${interp[@]}" "$@"
and then run the script like: wrapper.sh script.sh
Limited to 127 chars on 99.9% of systems due to kernel compile time buffer limit.
It's limited in the kernel by BINPRM_BUF_SIZE
, set in include/linux/binfmts.h
.