I just noticed some behavior changes within sed. Run the following
commands in various distros.
#!/bin/bash
set -x
echo "abc" > original.txt
ln -s original.txt symlink.txt
sed -i 's/abc/123/' symlink.txt
if [ -L symlink.txt ]; then
echo yes symlink
else
echo not symlink anymore
fi
cat original.txt
cat symlink.txt
RHEL5
=====
[u...@rhel5 ~]$ echo "abc" > original.txt
[u...@rhel5 ~]$ ln -s original.txt symlink.txt
[u...@rhel5 ~]$ sed -i 's/abc/123/' symlink.txt
sed: ck_follow_symlink: couldn't lstat s/original.txt: No such file or
directory
[u...@rhel5 ~]$ cat symlink.txt
abc
[u...@rhel5 ~]$ cat original.txt
abc
original.txt is unmodified, symlink.txt is still a symlink.
Fedora 10
=========
[u...@fedora10 ~]$ echo "abc" > original.txt
[u...@fedora10 ~]$ ln -s original.txt symlink.txt
[u...@fedora10 ~]$ sed -i 's/abc/123/' symlink.txt
[u...@fedora10 ~]$ cat symlink.txt
123
[u...@fedora10 ~]$ cat original.txt
123
original.txt is modified, symlink.txt is still a symlink.
Fedora 11 and 12
================
[u...@fedora11 ~]$ echo "abc" > original.txt
[u...@newcaprica ~]$ ln -s original.txt symlink.txt
[u...@newcaprica ~]$ sed -i 's/abc/123/' symlink.txt
[u...@newcaprica ~]$ cat original.txt
abc
[u...@newcaprica ~]$ cat symlink.txt
123
original.txt is not modified, symlink.txt is no longer a symlink.
symlink.txt now contains a modified version of original.txt as a plain file.
What is the correct behavior? Is this a bug that it changed?
Warren Togami
[email protected]
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