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Pavan Manjunath
Asked: 2012-04-05 03:34:32 +0800 CST

How to rename libc.a back

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I am working on AIX 6.1 and inadvertently renamed /usr/lib/libc.a to usr/lib/libc.a_ Just as I renamed I realized my stupid mistake. Almost all of the commands mv, cp, ftp etc ( except cd ) have stopped working.

How shall I rename by libc.a back. Without it, the system hardly functions sanely :(

command-line-interface aix rename mv

5 Answers

  1. Most of the binaries depend/use on the libc library. To find out, you can use ldd /path/to/binary It seems that you need to boot another image or live CD. Then, you can mount the relevant partition (/usr if it is separated or /) and rename the file.

    • 3

  2. Just posting this in case someone else searches for this issue.

    Since at least AIX 5.3 IBM has provided the recovery shell recsh just for this issue.

    Check IBM Documentation.

    Example of use: recsh; cp -p libc.a.new /usr/lib/libc.a; exit

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  3. I guess ln is out of question, too? 

    ln -s usr/lib/libc.a_ usr/lib/libc.a

    Or Perl?

    perl -e 'symlink("usr/lib/libc.a_","usr/lib/libc.a");'

    or

    perl -MFile::Copy -e 'copy("usr/lib/libc.a_","usr/lib/libc.a");'
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  4. Try while read -r x; do echo $x >> libc.a; done < libc.a_ (This assumes a Bourne style shell).

    If it fails and you are lucky enough that ed or sed are statically linked try:

    sed libc.a_ > libc.a

    or

    ed libc.a_
w libc.a
q

    also dd if=libc.a_ of=libc.a

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  5. Boot from rescue disk, mount filesystem, do rename.

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