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# Linux fmt Command [ Linux Command Reference](#) The Linux `fmt` command is used to format text files. The `fmt` command reads content from specified files, reformats it according to specified formats, and outputs it to standard output. If the specified filename is "-", the `fmt` command reads data from standard input. ### Syntax fmt [file...] **Parameter Description**: * -c or --crown-margin Indent the first two columns of each paragraph. * -p or --prefix= Only merge columns containing the specified string, commonly used for comments in programming languages. * -s or --split-only Only split columns that exceed the column width, but do not merge columns that are shorter than the column width. * -t or --tagged-paragraph Indent the first two columns of each paragraph, but with different indentation formats for the first and second columns. * -u or --uniform-spacing Use a single space character between each character, and two space characters between each sentence. * -w or --width= or - Set the maximum number of characters per column. * --help Online help. * --version Display version information. ### Examples Reformat a specified file. For example, if the file `testfile` contains 5 lines of text, you can use the command to reformat the file. The command is: fmt testfile The output result is as follows: $ fmt testfile #Reformat testfile file hello Linux! Linux is a free Unix-type operating system. This is a Linux testfile! Linux Linux Reformat the file `testfile` to 85 characters per line and output to standard output. The command should be: fmt -w 85 testfile For comparison, first use the `cat` command to view the file contents: $ cat testfile #View the contents of testfile file hello Linux! Linux is a free Unix-type operating system. This is a Linux testfile! Linux Linux After reformatting with the `fmt` command, the output result is as follows: $ fmt -w 85 testfile #Specify reformatting width as 85 characters hello Linux! Linux is a free Unix-type operating system. This is a Linux testfile! Linux Linux [ Linux Command Reference](#)