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Size: 1221
Comment: Not much point in using "$@" here. Changing to "$1".
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| == How do I process options in a bash script? == For example, how do I code my bash script to accept a bunch of options like |
== Common utility functions (warn, die) == (If you were looking for option processing, see [[BashFAQ/035]].) The following functions are frequently asked for in #bash, so we hope you find them useful. |
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| foobar -a --busy --include something | ## # warn: Print a message to stderr. # Usage: warn "message" # warn() { printf '%s\n' "$1" >&2 } ### ### The following three "die" functions ### depend on the above "warn" function. ### ## # die (simple version): Print a message to stderr # and exit with the exit status of the most recent # command. # Usage: some_command || die "message" # die () { local st="$?" warn "$1" exit "$st" } ## # die (explicit status version): Print a message to # stderr and exit with the exit status given. # Usage: if blah; then die "message" status_code; fi # die() { local st="$2" warn "$1" exit "$st" } ## # die (optional status version): Print a message to # stderr and exit with either the given status or # that of the most recent command. # Usage: some_command || die "message" [status code] # die() { local st="$?" case "$2" in *[^0-9]*) :;; *) st="$2";; esac warn "$1" exit "$st" } |
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First up, there are some [[http://www.gnu.org/software/libtool/manual/libc/Argument-Syntax.html][GNU and POSIX standards]] for how to do this. |
Common utility functions (warn, die)
(If you were looking for option processing, see BashFAQ/035.) The following functions are frequently asked for in #bash, so we hope you find them useful.
##
# warn: Print a message to stderr.
# Usage: warn "message"
#
warn() {
printf '%s\n' "$1" >&2
}
###
### The following three "die" functions
### depend on the above "warn" function.
###
##
# die (simple version): Print a message to stderr
# and exit with the exit status of the most recent
# command.
# Usage: some_command || die "message"
#
die () {
local st="$?"
warn "$1"
exit "$st"
}
##
# die (explicit status version): Print a message to
# stderr and exit with the exit status given.
# Usage: if blah; then die "message" status_code; fi
#
die() {
local st="$2"
warn "$1"
exit "$st"
}
##
# die (optional status version): Print a message to
# stderr and exit with either the given status or
# that of the most recent command.
# Usage: some_command || die "message" [status code]
#
die() {
local st="$?"
case "$2" in
*[^0-9]*) :;;
*) st="$2";;
esac
warn "$1"
exit "$st"
}