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sources/tech/20220524 The Basic Concepts of Shell Scripting.md
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@ -50,7 +50,7 @@ $man date
The redirection operator is really useful when you want to capture the output of a command in a file or redirect to a file.
| - | - |
| Command | Description |
| :- | :- |
| $ls -l /usr/bin >file | default stdout to file |
| $ls -l /usr/bin 2>file | redirects stderr to file |
@ -78,7 +78,7 @@ This creates a directory for 12 months from 2009 to 2011.
An environment variable is a dynamic-named value that can affect the way running processes will behave on a computer. This variable is a part of the environment in which a process runs.
| - | - |
| Command | Description |
| :- | :- |
| printenv | Print part of all of the environment |
| set | set shell options |
@ -89,7 +89,7 @@ An environment variable is a dynamic-named value that can affect the way running
Network commands are very useful for troubleshooting issues on the network and to check the particular port connecting to the client.
| - | - |
| Command | Description |
| :- | :- |
| ping | Send ICMP packets |
| traceroute | Print route packets to a network |
@ -105,7 +105,7 @@ interface stats |
Grep commands are useful to find the errors and debug the logs in the system. It is one of the powerful tools that shell has.
| - | - |
| Command | Description |
| :- | :- |
| grep -h ‘.zip’ file.list | . is any character |
| grep -h ‘^zip’ file.list | starts with zip |
@ -118,7 +118,7 @@ Grep commands are useful to find the errors and debug the logs in the system. It
Here are some examples of quantifiers:
| - | - |
| Command | Description |
| :- | :- |
| ? | match element zero or one time |
| * | match an element zero or more times |
@ -129,7 +129,7 @@ Here are some examples of quantifiers:
Text processing is another important task in the current IT world. Programmers and administrators can use the commands to dice, cut and process texts.
| - | - |
| Command | Description |
| :- | :- |
| cat -A $FILE | To find any CTRL character introduced |
| sort file1.txt file2.txt file3.txt >
@ -151,7 +151,7 @@ by numeric |
In Linux, we can go back to our history of commands by either using simple commands or control options.
| - | - |
| Command | Description |
| :- | :- |
| clear | clears the screen |
| history | stores the history |