Grep command series: Search from files and display file names

Grep command series: Search from files and display file names

How can I search for (grep) from several files and display only the names of matched files?

When you search for more than one file, the file name is displayed by default:

1. Grep "word" File Name
2. grep root /etc/*

Sample output:

1. /etc/bash.bashrc:See"man sudo_root"for details.
2. /etc/crontab:17**** root cd/&& run-parts --report /etc/cron.hourly
3. /etc/crontab:256*** root test-x /usr/sbin/anacron ||(cd/&& run-parts --report /etc/cron.daily )
4. /etc/crontab:476**7 root test-x /usr/sbin/anacron ||(cd/&& run-parts --report /etc/cron.weekly )
5. /etc/crontab:5261** root test-x /usr/sbin/anacron ||(cd/&& run-parts --report /etc/cron.monthly )
6. /etc/group:root:x:0:
7. grep:/etc/gshadow:Permission denied
8. /etc/logrotate.conf: create 0664 root utmp
9. /etc/logrotate.conf: create 0660 root utmp

The first part of each line is the file name (for example,/etc/crontab and/etc/group ). You can use the-l option to display only the file name:

1. grep-l "string" filename
2. grep-l root /etc/*

Sample output:

1. /etc/aliases
2. /etc/arpwatch.conf
3. grep:/etc/at.deny:Permission denied
4. /etc/bash.bashrc
5. /etc/bash_completion
6. /etc/ca-certificates.conf
7. /etc/crontab
8. /etc/group

You can also reverse the output. Use the-L option to output the file names of those unmatched files:

1. grep-L "word" filename
2. grep-L root /etc/*

Sample output:

1. /etc/apm
2. /etc/apparmor
3. /etc/apparmor.d
4. /etc/apport
5. /etc/apt
6. /etc/avahi
7. /etc/bash_completion.d
8. /etc/bindresvport.blacklist
9. /etc/blkid.conf
10. /etc/bluetooth
11. /etc/bogofilter.cf
12. /etc/bonobo-activation
13. /etc/brlapi.key

Grep uses concise and Regular Expressions

Regular Expression usage

Assertion with Zero Width of a regular expression

Linux Command-grep for file text operations

Grep Regular Expression

Regular Expressions and file formatting commands in Linux (awk/grep/sed)

Via: http://www.cyberciti.biz/faq/grep-from-files-and-display-the-file-name/

Author: Vivek Gite Translator: wxy Proofreader: wxy

This article was originally compiled by LCTT and launched with the honor of Linux in China

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