Home » 14-commandes de recherche sous linux grep,find #darija | linux grep

14-commandes de recherche sous linux grep,find #darija | linux grep

by Hanh Nguyen

14-commandes de recherche sous linux grep,find #darija


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14-commandes de recherche sous linux grep,find #darija

Redirection in Linux – Linux Tutorial 8


https://www.guru99.com/linuxredirection.html this video explains the concept of redirection in Linux.
Click on the time points below to view different sections!
0:03 Redirection
2:08 Input Redirection
3:16 Any Program/ Command
3:34 Error Redirection
3:48 Why Error Redirection?
What is Redirection?
Redirection is a feature in Linux such that when executing a command, you can change the standard input/output devices.
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Redirection in Linux - Linux Tutorial 8

Linux Command Line Tutorial For Beginners 37 – grep command


grep, egrep, fgrep print lines matching a pattern
use:
grep [OPTIONS] PATTERN [FILE…]
grep [OPTIONS] [e PATTERN | f FILE] [FILE…]
Description:
grep searches the named input FILEs (or standard input if no files are named, or if a single hyphenminus () is given as file name) for lines containing a match to the given PATTERN. By default, grep prints the matching lines.
In addition, two variant programs egrep and fgrep are available. egrep is the same as grep E. fgrep is the same as grep F. Direct invocation as either egrep or fgrep is deprecated, but is provided to allow historical applications that rely on them to run unmodified.
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Linux Command Line Tutorial For Beginners 37 - grep command

Linux Command Line (36) grep


In the early days of Unix grep stood for Global Regular Expression Print
We use grep to find regular expressions (also known as regex) text strings in a file.
The entire line that contains the regular expression is returned.
Grep is case sensitive (that we can turn off with the i option) and can return lines containing the regex as a word (with whitespace characters on both sides of the regex)
We then add the n option to grep show the line numbers our regex is found and we can also grep the inverse (meaning show all the lines in the file except the lines the regex is found on) by using the v option.
We can grep the count the number of times our regex is found with the c option
We also look at how to pipe text into grep with ls lh | grep ‘2019’

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Linux Command Line (36) grep

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