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authorRoland McGrath <roland@gnu.org>1995-02-21 06:15:34 +0000
committerRoland McGrath <roland@gnu.org>1995-02-21 06:15:34 +0000
commit01cc0be62795f0afee7d7866bb2ec2f24b92dcee (patch)
treec42e7c1791bac6822956cb70a45c1015db4353ea /move-if-change
parent* sysdeps/unix/start.c (errno): Only define if it's not #define'd (diff)
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* Makefile (subdirs): Add elf first.
* elf/Makefile: New file. * elf/elf.h: New file.
Diffstat (limited to 'move-if-change')
-rwxr-xr-xmove-if-change17
1 files changed, 17 insertions, 0 deletions
diff --git a/move-if-change b/move-if-change
new file mode 100755
index 0000000000..66d8b8adc7
--- /dev/null
+++ b/move-if-change
@@ -0,0 +1,17 @@
+#!/bin/sh
+# Like mv $1 $2, but if the files are the same, just delete $1.
+# Status is 0 if $2 is changed, 1 otherwise.
+if
+test -r $2
+then
+if
+cmp -s $1 $2
+then
+echo $2 is unchanged
+rm -f $1
+else
+mv -f $1 $2
+fi
+else
+mv -f $1 $2
+fi