Difference between revisions of "Linux comand: grep"
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| − | + | Command-line utility to search lines matching regular expresions in plain-text data sets. | |
| − | + | ||
| + | {| class="wikitable" | ||
| + | |- | ||
| + | ! Option !! Description !! Example | ||
| + | |- | ||
| + | | -c || Count || grep -c 'root' /etc/passwd | ||
| + | |- | ||
| + | | -e || Specify multiple search patterns || grep -e 'root' -e 'system' /etc/passwd | ||
| + | |- | ||
| + | | -r || Recursive || Example | ||
| + | |- | ||
| + | | -v || Show lines not matching the pattern || Example | ||
| + | |- | ||
| + | | -i || Case insensitive || Example | ||
| + | |- | ||
| + | | -n || Output line numbering || Example | ||
| + | |- | ||
| + | | -E || Enable regex use (similar to egrep) || Example | ||
| + | |- | ||
| + | | -o || Show only the match, not the full line || Example | ||
| + | |- | ||
| + | | -f FILE || Example || Example | ||
| + | |- | ||
| + | | -H || Print file name || Example | ||
| + | |- | ||
| + | | Example || Example || Example | ||
| + | |} | ||
| + | |||
| + | Examples: | ||
| + | <source lang="bash"> | ||
| + | grep '\<a.*\>' archivo | ||
| + | cat archivo | grep "\<a.*\>" | ||
| + | grep "#" /boot/grub/menu.lst | ||
| + | grep -v "#" /boot/grub/menu.lst | ||
| + | grep -c "iface" /etc/network/interfaces | ||
| + | grep -e "root" -e "password" archivo | ||
| + | grep -n -e "root" -e "password" archivo | ||
| + | grep -r "password" * | ||
| + | ifconfig eth0 | grep -oiE '([0-9A-F]{2}:){5}[0-9A-F]{2}' # Show eth0 MAC address | ||
| + | grep -Eio '[a-z0-9._-]+@[a-z0-9.-]+[a-z]{2,4}' file.txt # Extract e-main addresses from file.txt | ||
| + | |||
| + | |||
| + | </source> | ||
Revision as of 08:18, 11 November 2015
Command-line utility to search lines matching regular expresions in plain-text data sets.
| Option | Description | Example |
|---|---|---|
| -c | Count | grep -c 'root' /etc/passwd |
| -e | Specify multiple search patterns | grep -e 'root' -e 'system' /etc/passwd |
| -r | Recursive | Example |
| -v | Show lines not matching the pattern | Example |
| -i | Case insensitive | Example |
| -n | Output line numbering | Example |
| -E | Enable regex use (similar to egrep) | Example |
| -o | Show only the match, not the full line | Example |
| -f FILE | Example | Example |
| -H | Print file name | Example |
| Example | Example | Example |
Examples:
grep '\<a.*\>' archivo
cat archivo | grep "\<a.*\>"
grep "#" /boot/grub/menu.lst
grep -v "#" /boot/grub/menu.lst
grep -c "iface" /etc/network/interfaces
grep -e "root" -e "password" archivo
grep -n -e "root" -e "password" archivo
grep -r "password" *
ifconfig eth0 | grep -oiE '([0-9A-F]{2}:){5}[0-9A-F]{2}' # Show eth0 MAC address
grep -Eio '[a-z0-9._-]+@[a-z0-9.-]+[a-z]{2,4}' file.txt # Extract e-main addresses from file.txt