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Shell Programming and Scripting
Script for updating the comments field on /etc/passwd on redhat linux
Post 302269914 by Linux Duke on Friday 19th of December 2008 05:10:15 AM
12-19-2008
Script for updating the comments field on /etc/passwd on redhat linux
Hi there,
I have more that 300 servers that I need to updated the comments field on /etc/passwd for users that have a blank comments fields. The users have accounts on different servers. I have created a list of these users on a text file called update_passwd.txt.
I need a script that will compare this file with /etc/passwd first backup the passwd database and update the comment field on /etc/passwd with the details on the text file if it's blank.
I have a script that I have created not sure if it will do the job as I have not worked a lot with scripts.
Below is my script and attached is my text file:
#!/usr/bin/bash
FILE1=/tmp/update_passwd.txt
FILE2=/etc/passwd
cp $FILE2 /etc/passwd.orig
for i in `cat $FILE1 | awk -F":" '{ print $2 }'`
do
FIELD1=`cat $FILE1 | grep ${i} |awk -F":" '{ print $3 }'`
grep $i ${FILE2}
if [ $? -eq 0 ]
then
usermod -c "${FIELD1}" $i
fi
done
I will highly appreciate your assistance.
I have more that 300 servers that I need to updated the comments field on /etc/passwd for users that have a blank comments fields. The users have accounts on different servers. I have created a list of these users on a text file called update_passwd.txt.
I need a script that will compare this file with /etc/passwd first backup the passwd database and update the comment field on /etc/passwd with the details on the text file if it's blank.
I have a script that I have created not sure if it will do the job as I have not worked a lot with scripts.
Below is my script and attached is my text file:
#!/usr/bin/bash
FILE1=/tmp/update_passwd.txt
FILE2=/etc/passwd
cp $FILE2 /etc/passwd.orig
for i in `cat $FILE1 | awk -F":" '{ print $2 }'`
do
FIELD1=`cat $FILE1 | grep ${i} |awk -F":" '{ print $3 }'`
grep $i ${FILE2}
if [ $? -eq 0 ]
then
usermod -c "${FIELD1}" $i
fi
done
I will highly appreciate your assistance.
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LEARN ABOUT XFREE86
comm
COMM(1) User Commands COMM(1) NAME
comm - compare two sorted files line by line SYNOPSIS
comm [OPTION]... FILE1 FILE2 DESCRIPTION
Compare sorted files FILE1 and FILE2 line by line. When FILE1 or FILE2 (not both) is -, read standard input. With no options, produce three-column output. Column one contains lines unique to FILE1, column two contains lines unique to FILE2, and column three contains lines common to both files. -1 suppress column 1 (lines unique to FILE1) -2 suppress column 2 (lines unique to FILE2) -3 suppress column 3 (lines that appear in both files) --check-order check that the input is correctly sorted, even if all input lines are pairable --nocheck-order do not check that the input is correctly sorted --output-delimiter=STR separate columns with STR --total output a summary -z, --zero-terminated line delimiter is NUL, not newline --help display this help and exit --version output version information and exit Note, comparisons honor the rules specified by 'LC_COLLATE'. EXAMPLES
comm -12 file1 file2 Print only lines present in both file1 and file2. comm -3 file1 file2 Print lines in file1 not in file2, and vice versa. AUTHOR
Written by Richard M. Stallman and David MacKenzie. REPORTING BUGS
GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report comm translation bugs to <http://translationproject.org/team/> COPYRIGHT
Copyright (C) 2017 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
join(1), uniq(1) Full documentation at: <http://www.gnu.org/software/coreutils/comm> or available locally via: info '(coreutils) comm invocation' GNU coreutils 8.28 January 2018 COMM(1)