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cat command is used to concatenate, display and print the content of files.
Usage:
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The Syntax is
cat [-benstuv] [-] [file ...]
Options:
| Options | Description |
| -b | Number the non-blank output lines, starting at 1. |
| -n | Number the output lines, starting at 1. |
| -s | Squeeze multiple adjacent empty lines, causing the output to be single spaced. |
| -u | Disable output buffering. |
| -v | Displays non-printing characters so they are visible. |
| -e | Display non-printing characters and display a dollar sign ($) at the end of each line. |
| -t | Display non-printing characters and display tab characters as ^I at the end of each line. |
Example:
cat results 0 if the execution is success and return >0 if an error occurs in the execution.- To Create a new file
This command creates a new file sample.txt. After typing the file press control+d (^d) simultaneously to end the file. - To Append data into the file
To append data into the same file use append operator “>>†to write into the file, else the file will be overwritten (i.e., all of its contents will be erased) - To display a file:
This command displays the data in the file. - To concatenate several files and display
The above cat command will concatenate the two files (sample.txt and sample1.txt) and displays the output in the screen. Some times the output may not fit for the monitor size. In such situation you can print those files in a new file or display the file using appropriate command. - To concatenate several files and to transfer the output to another file.cat sample.txt sample1.txt > file3.txt
In the above example the output is redirected to new file file3.txt. The cat command will create new file file3.txt and store the concatenated output into file3.txt.
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