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# Linux ispell Command [ Linux Command Manual](#) The Linux ispell command is used for spell checking. ispell uses the dictionary file `/usr/lib/ispell/english.hash` by default to check text files. If a word in the file being checked is not found in the dictionary, ispell will suggest corrections or allow you to add the new word to your personal dictionary. ### Syntax ispell **Parameters**: * `-a` Must be used when output from other programs is piped to ispell. * `-A` When the string "&Include File&" is encountered, check the contents of the file specified after the string. * `-b` Create a backup file with the extension `.bak`. * `-B` Check for compound word errors. * `-C` Do not check for compound word errors. * `-d` Specify the dictionary file. * `-l` Read strings from standard input and display misspelled words when finished. * `-L` Specify the number of lines to display in the context. * `-m` Automatically consider suffix variations. * `-M` After entering ispell, display command keys at the bottom of the screen. * `-n` The file to be checked is in noff or troff format. * `-N` After entering ispell, do not display command keys at the bottom of the screen. * `-p` Specify the personal dictionary file. * `-P` Do not consider suffix variations. * `-S` Do not sort the suggested replacement words. * `-t` The file to be checked is in TeX or LaTeX format. * `-V` Non-ANSI standard characters are displayed as "M-^". * `-w` During checking, specifically pick out words containing the specified characters. * `-W` Do not check words of the specified length. * `-x` Do not create backup files. ### Example Check the spelling of a file. For example, to check the file `testfile`, use the following command: ispell testfile If a suspicious word appears in the file, the first occurrence is highlighted, and correction suggestions along with ispell's command keys are displayed at the bottom of the screen. It looks like this: netwrks File: testfile Linux netwrks are becoming more and more common, but security is often an overlooked issue. Unfortunately 0: networks R)epl A)ccept I)nsert L)ookup U)ncap Q)uit e(X)it or ? for help In this example, `netwrks` is identified as an error, and correction information is provided. Entering "0" uses `networks` to correct the error, and then the next error is displayed until all errors are shown. From the example above, we can see that the file `testfile` contains spelling errors. After modifying the file, a backup is needed. Use the following command: ispell-b testfile #Check for spelling errors and create a backup file If the file has no spelling errors, no information is displayed. Using the `ls` command, we can see that a backup file `testfile.bak` has been created in the current directory. The result is shown below: $ ls #List files in the current directory examples.desktop testfile_1 testfile.bak xx01 Templates Pictures Music testfile testfile1 testfile_2 xx00 Public Videos Documents Desktop Here, `testfile.bak` is the backup file generated by the command, and its content is identical to the original `testfile`. [ Linux Command Manual](#)