diff options
author | Luke Shumaker <lukeshu@sbcglobal.net> | 2016-07-12 01:55:16 -0400 |
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committer | Luke Shumaker <lukeshu@sbcglobal.net> | 2016-07-12 01:55:16 -0400 |
commit | ad057ec1d88d71018e1d82c2fb765a4f7a746579 (patch) | |
tree | 58d1e98dc79fae31dcd79d2542401de9a3227452 /write-ifchanged |
initial commit
Diffstat (limited to 'write-ifchanged')
-rwxr-xr-x | write-ifchanged | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/write-ifchanged b/write-ifchanged new file mode 100755 index 0000000..185ceb0 --- /dev/null +++ b/write-ifchanged @@ -0,0 +1,25 @@ +#!/usr/bin/env bash +# Copyright (C) 2015 Luke Shumaker +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU Affero General Public License as published by +# the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU Affero General Public License for more details. +# +# You should have received a copy of the GNU Affero General Public License +# along with this program. If not, see <http://www.gnu.org/licenses/>. + +outfile=$1 +tmpfile="$(dirname "$outfile")/.tmp${outfile##*/}" + +cat > "$tmpfile" || exit $? +if cmp -s "$tmpfile" "$outfile"; then + rm -f "$tmpfile" || : +else + mv -f "$tmpfile" "$outfile" +fi |