Shulou(Shulou.com)06/01 Report--

Today, I would like to talk to you about the remedies for the erroneous implementation of chmod 777. * or chown-R * in Linux. Many people may not know much about it. In order to make you understand better, the editor summed up the following content for you. I hope you can get something from this article.

Mistakenly executed commands: chmod 777. * or chown-R *, etc., resulting in confusion of permissions in the entire operating system, and invalidation of some commands and devices. Do not restart at this time. The main way to change the permissions of each file back on it.

How can I restore the system files to the default state of the initial installation?

Principle: we install through pkgadd (pkgadd is recommended to install all package)

All files are recorded in detail in the / var/sadm/install/contents file.

The center of the following method is to use the records in this file to restore its state. Suppose your current id is root.

# cd / var/sadm/install

# redirect all lines in the contents file that do not contain the = (equal sign) or / devices to a new file contents.txt

# egrep-v "= | devices" contents > contents.txt

1. Deal with contents.txt. Extract 1, 4, 5, 6 columns and put them into another text.

Awk'{print $1, 4, 5, 6} 'contents.txt > contents.txt2

If this command goes wrong and the reason is "to many fields record number XXX", use the

Vi contents.txt

: g/SUNW/d

Use: instead of whitespace

Sed's / /: / g 'contents.txt2 > contents.txt3

2. Write a script to reset system permissions

# use vi to edit the following script file restore_perms

# vi restore_perms### # Begin #! / bin/bash for FILE in `cat / var/sadm/install/ contents.txt3`do FNAME= `echo $FILE | awk-F:'{print $1} '`PERM= `echo $FILE | awk-F:' {print $2} '`OWNR= `echo $FILE | awk -F:'{print $3} '`GRP= `echo $FILE | awk-F:' {print $4} '`echo "chown $OWNR:$GRP $FNAME" chown $OWNR:$GRP $FNAME echo "chmod $PERM $FNAME" chmod $PERM $FNAME done # rm contents.txt3 # End # Restore_perms script execution permission # chmod + x restore_perms # execute this script #. / restore_perms echo'/ opt/CTEact/kmdb/5.10/sparcv9:0755:bin:bin' | awk-F:'{print $1}'

After modification is completed, files with s-bit permissions need to be modified manually.

After reading the above, do you have any further understanding of the remedies for the erroneous execution of chmod 777.or chown-R * by Linux? If you want to know more knowledge or related content, please follow the industry information channel, thank you for your support.

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