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The awk utility provides a powerful way to search for text strings using regex. This great tool will help you solve many Bash shell script needs.
If you wanted to perform simple operations on a text file, access_log for example, awk is a very useful and simple tool to use. The following example, show the command awk searching for the text string “Debian” in access_log for an apache web server. It will return the lines that contain the text string. The reason for the single quotes instead of the double quotes is to prevent the shell from interpreting characters within the program as special shell characters
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