12-04-2013
You said you want to use sed or awk, cut (as suggested by rbatte1) is another possibility. I would guess that awk will be better for this job than sed.
You've been watching what we have been doing here for more than 1.5 years.
Can you show us how to use awk (or grep and cut) to get the UID, GID, and home directory for root out of /etc/passwd?
Once you have those values, can you show us how to use awk or cut to find other users with the same UID as root, the same GID as root, or the same home directory as root?
Show us that you have made an attempt to solve this problem by showing us what you have tried so far. Tell us what is working and what you can't get to work yet.
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----------------------------------
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IGAWK(1) Utility Commands IGAWK(1)
NAME
igawk - gawk with include files
SYNOPSIS
igawk [ all gawk options ] -f program-file [ -- ] file ...
igawk [ all gawk options ] [ -- ] program-text file ...
DESCRIPTION
Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1).
AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like
@include getopt.awk
in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path.
OPTIONS
See gawk(1) for a full description of the AWK language and the options that gawk supports.
EXAMPLES
cat << EOF > test.awk
@include getopt.awk
BEGIN {
while (getopt(ARGC, ARGV, "am:q") != -1)
...
}
EOF
igawk -f test.awk
SEE ALSO
gawk(1)
Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995.
AUTHOR
Arnold Robbins (arnold@skeeve.com).
Free Software Foundation Nov 3 1999 IGAWK(1)