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* '''Text processing utilities''' such as grep, awk, cut.
 
* '''Text processing utilities''' such as grep, awk, cut.
 
* '''Functions''' -  add frequent actions together via functions. For example, /etc/init.d/functions file contains functions to be used by most or all system shell scripts in the /etc/init.d directory.
 
* '''Functions''' -  add frequent actions together via functions. For example, /etc/init.d/functions file contains functions to be used by most or all system shell scripts in the /etc/init.d directory.
* '''Control flow''' statments such as if..then..else or shell loops to preform repeated actions.
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* '''Control flow''' statments such as if..then..else or shell loops to perform repeated actions.
 
===Each script has purpose===
 
===Each script has purpose===
 
* '''Specific purpose''' - For example, backup file system and database to NAS server.
 
* '''Specific purpose''' - For example, backup file system and database to NAS server.
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