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Diffstat (limited to 'src')
-rwxr-xr-x | src/ifnew | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/src/ifnew b/src/ifnew new file mode 100755 index 0000000..c293f63 --- /dev/null +++ b/src/ifnew @@ -0,0 +1,33 @@ +#!/bin/sh +set -eu + +usage() { + cat <<-'EOF' + Usage: + ifnew [-v] FILE + EOF +} + +MV_ARGS='' +while getopts 'v' flag; do + case "$flag" in + (v) + MV_ARGS='-v' + ;; + (*) + usage >&2 + exit 2 + ;; + esac +done +shift $((OPTIND - 1)) + +FILE="${1:-}" +eval "$(assert-arg -- "$FILE" 'FILE')" + + +STDIN="$FILE.$(uuid).tmp" +trap 'rm -f "$STDIN"' EXIT + +cat - > "$STDIN" +cmp -s "$STDIN" "$FILE" || mv $MV_ARGS "$STDIN" "$FILE" |