#Grep unique lines free#
Linux is a free and open source Operating system that is mostly used byĭevelopers and in production servers for hosting crucial components such as webĪnd database servers. Lines containing the string “Linux” from the file welcome.txt It scans the file / input for a pattern and displays lines containing the patternĮxample: To demonstrate this, let’s create a text file welcome.txt. $ echo 'too many spaces here' | tr -s ''įilters Using Regular Expression : grep and sed $ echo "Welcome To GeeksforGeeks" | tr -d ‘W‘Įxample: convert multiple continuous spaces with a single space s squeezes multiple occurrences of a character into a single word d deletes a specified range of characters $ echo "linux dedicated server" | tr a-z A-Z
the tr command automatically translates (substitutes, or maps) one setĮxample : Convert lower case letters to upper case d lists only the lines that are duplicate uniq command reports or filters out the repeated lines in a fileĮxample : consider the following example.txt file Uniq command – locate repeated and non repeated lines
o flname places output in the file flnameĮxample : Sort a colon delimited text file on second field k m,n starts sort on the m filed & ends sort on nth filed t char uses delimiter character to identify fields sort command sorts the contents of the text file line by line
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