Grep - Revision history

Goldbolt: /* Using grep */

2019-07-18T15:55:02Z

‎Using grep

Goldbolt: /* Using grep */

2019-07-18T14:49:38Z

‎Using grep

Goldbolt: /* Using grep */

2019-04-05T11:32:40Z

‎Using grep

Goldbolt at 12:57, 15 January 2019

2019-01-15T12:57:23Z

Goldbolt at 19:36, 5 January 2019

2019-01-05T19:36:55Z

Goldbolt: Created page with "grep searches the named input FILEs (or standard input if no files are named, or if a single hyphen-minus (-) is given as file name) for lines containing a match to the given..."

2019-01-05T19:35:42Z

Created page with "grep searches the named input FILEs (or standard input if no files are named, or if a single hyphen-minus (-) is given as file name) for lines containing a match to the given..."

New page

grep searches the named input FILEs (or standard input if no files are named, or if a single hyphen-minus (-) is given as file name) for lines containing a match to the given PATTERN. By default, grep prints the matching lines. grep is a powerful tool.

=Using grep=
<strong>Recursively search DIR for "STRING" (also ignores caps)</strong>
grep -ri "STRING" /DIR/

<strong>Piping</strong>

grep can also be piped from or to other outputs using the pipe "|"

grep "STRING" /LOCATION/logfile.log |grep ANOTHERSTRING
Example usage:
grep "13:00:" /var/log/messages |grep "September"

tail -f /var/log/somefile.log |grep specificstring

@@ Line 23: / Line 23: @@
      cat file.txt | grep '^firstline'
-Recursively grep for STRING within /DIR using 8 cores in parallel:
+Recursively grep for STRING within /DIR using 8 threads in parallel:
     find /DIR -type f | parallel -k -j8 -n 1000 -m grep -H -n -ril STRING {}

← Older revision		Revision as of 14:49, 18 July 2019
Line 22:		Line 22:

	cat file.txt \| grep '^firstline'		cat file.txt \| grep '^firstline'
		+
		+	Recursively grep for STRING within /DIR using 8 cores in parallel:
		+
		+	find /DIR -type f \| parallel -k -j8 -n 1000 -m grep -H -n -ril STRING {}

← Older revision		Revision as of 12:57, 15 January 2019
Line 16:		Line 16:

	sudo cat /usr/local/apache/logs/error_log \| grep -i "modsec" \| awk '{print $10}' \| sort \| uniq -c \| sort -n		sudo cat /usr/local/apache/logs/error_log \| grep -i "modsec" \| awk '{print $10}' \| sort \| uniq -c \| sort -n
		+
		+	<strong>Remove everything but grep'd</strong>
		+
		+	This will show only lines with "firstline" within file.txt.
		+
		+	cat file.txt \| grep '^firstline'

← Older revision		Revision as of 19:36, 5 January 2019
Line 14:		Line 14:

	tail -f /var/log/somefile.log \|grep specificstring		tail -f /var/log/somefile.log \|grep specificstring
		+
		+	sudo cat /usr/local/apache/logs/error_log \| grep -i "modsec" \| awk '{print $10}' \| sort \| uniq -c \| sort -n

@@ Line 3: / Line 3: @@
 =Using grep=
 <strong>Recursively search DIR for "STRING" (also ignores caps)</strong>
-      grep -ri "STRING" /DIR/
+      grep -irl "STRING" /DIR/
 <strong>Piping</strong>