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Top Forums Shell Programming and Scripting Find users with root UID or GID or root home Post 302877985 by Don Cragun on Wednesday 4th of December 2013 06:11:45 AM
Old 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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CUT(1)							      General Commands Manual							    CUT(1)

NAME
cut - select out columns of a file SYNOPSIS
cut [ -b | -c] list [file...] cut -f list [-d delim] [ -s] OPTIONS
-b Cut specified bytes -c Select out specific characters -d Change the column delimiter to delim -f Select out specific fields that are separated by the -i Runs of delimiters count as one -s Suppres lines with no delimiter characters, when used EXAMPLES
cut -f 2 file # Extract field 2 cut -c 1-2,5 file # Extract character columns 1, 2, and 5 cut -c 1-5,7- file # Extract all columns except 6 DESCRIPTION
[file...]" delimiter character ( see delim)" with the -f option. Lines with no delimiters are passwd through untouched" Cut extracts one or more fields or columns from a file and writes them on standard output. If the -f flag is used, the fields are sepa- rated by a delimiter character, normally a tab, but can be changed using the -d flag. If the -c flag is used, specific columns can be specified. The list can be comma or BLANK separated. The -f and -c flags are mutually exclusive. Note: The POSIX1003.2 standard requires the option -b to cut out specific bytes in a file. It is intended for systems with multi byte characters (e.g. kanji), since MINIX uses only one byte characters, this option is equivalent to -c. For the same reason, the option -n has no effect and is not listed in this man- ual page. SEE ALSO
sed(1), awk(9). CUT(1)
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