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| Deletions are marked like this. | Additions are marked like this. |
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| # Usage: warn "message" | # Usage: warn "format" ["arguments"...] |
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| printf '%s\n' "$@" >&2 | local fmt="$1" shift printf "script_name: $fmt\n" "$@" >&2 |
| Line 23: | Line 25: |
| # Usage: some_command || die "message" | # Usage: some_command || die "message" ["arguments"...] |
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| # Usage: if blah; then die "message" status_code; fi | # Usage: if blah; then die status_code "message" ["arguments"...]; fi |
| Line 37: | Line 39: |
| local st="$2" warn "$1" |
local st="$1" shift warn "$@" |
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| # Usage: some_command || die "message" [status code] | # Usage: some_command || die [status code] "message" ["arguments"...] |
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| case "$2" in *[^0-9]*) :;; *) st="$2";; esac warn "$1" |
if [[ "$1" != *[^0-9]* ]]; then st="$1" shift fi warn "$@" |
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 "format" ["arguments"...]
#
warn() {
local fmt="$1"
shift
printf "script_name: $fmt\n" "$@" >&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" ["arguments"...]
#
die () {
local st="$?"
warn "$@"
exit "$st"
}
##
# die (explicit status version): Print a message to
# stderr and exit with the exit status given.
# Usage: if blah; then die status_code "message" ["arguments"...]; fi
#
die() {
local st="$1"
shift
warn "$@"
exit "$st"
}
##
# die (optional status version): Print a message to
# stderr and exit with either the given status or
# that of the most recent command.
# Usage: some_command || die [status code] "message" ["arguments"...]
#
die() {
local st="$?"
if [[ "$1" != *[^0-9]* ]]; then
st="$1"
shift
fi
warn "$@"
exit "$st"
}