CS & IT Solutions

Text processing in Linux can be done using sed, cut, grep commands and with vi editor. We can find and replace a string, find and delete string etc.

Finding IP Addresses from Apache Log file through cut command

• The -d ‘-’ refers to delimeter –
• The -f1 is for first field in Apache log file

Remove particular IP Addresses from Apache log through sed command

• The -ie refers to inline edit in file
• The ‘/^10 indicates that IP must start with 10
• The \ indicates that special character . is text
• The /d indicates that delete this line

Remove lines containing a key word through sed

• The 1,30 refers to first 30 lines
• The {/index/d} indicates delete lines containing word “index”

Remove blank lines from a text file using vi editor

• The g refers globally
• The ^$/ d indicates delete blank lines

Remove special character # from a text file using vi editor

• The $s/ refers search from start
• The \# indicates take # as character
• The //g replace it with nothing i.e remove character

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