Author Archives: Ahmed Tawfik

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About Ahmed Tawfik

Cybersecurity Professional, Systems Engineer, OSS & Linux Geek

Highlight your grep results

Posted on August 25, 2009 by Ahmed Tawfik

Used grep command before ?grep is a very good command that allows you to grep text 🙂It allows you to search the contents of a file/group of files for a string (regular expression) of course it is great, but the … Continue reading →

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Print the exact contents for a file

Posted on August 25, 2009 by Ahmed Tawfik

If you want to print the exact contents of a file (the white spaces, the new lines), use this command: more file_name | od -c

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Count number of lines in a text file

Posted on August 24, 2009 by Ahmed Tawfik

wc -l file_name

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Extract Lines From a Text File

Posted on August 24, 2009 by Ahmed Tawfik

“sed -n 2,4p file_name” extracts lines from 2 to 4 from that file

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How to compress using bzip2 without deleting the original file

Posted on August 24, 2009 by Ahmed Tawfik

bzip2 deletes the original file and replaces it by the compressed one, and to stop it from doing that use the “-k” option as follows: “bzip2 -k file_name“

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