NAME

       shfmt - Format shell programs

SYNOPSIS

       shfmt [flags] [path...]

DESCRIPTION

       shfmt formats shell programs. If the only argument is a dash (-) or no arguments are
       given, standard input will be used. If a given path is a directory, all shell scripts
       found under that directory will be used.

       If any EditorConfig files are found, they will be used to apply formatting options. If any
       parser or printer flags are given to the tool, no EditorConfig files will be used. A
       default like -i=0 can be used for this purpose.

       shfmt's default shell formatting was chosen to be consistent, common, and predictable.
       Some aspects of the format can be configured via printer flags.

OPTIONS

   Generic flags
       -version
           Show version and exit.

       -l, --list
           List files whose formatting differs from shfmt's.

       -w, --write
           Write result to file instead of stdout.

       -d, --diff
           Error with a diff when the formatting differs.

           The diff uses color when the output is a terminal. To never use color, set a non-empty
           NO_COLOR or TERM=dumb. To always use color, set a non-empty FORCE_COLOR.

       -s, --simplify
           Simplify the code.

       -mn, --minify
           Minify the code to reduce its size (implies -s).

   Parser flags
       -ln, --language-dialect <str>
           Language dialect (bash/posix/mksh/bats, default auto).

           When set to auto, the language is detected from the input filename, as long as it has
           a shell extension like foo.mksh. Otherwise, if the input begins with a shell shebang
           like #!/bin/sh, that's used instead. If neither come up with a result, bash is used as
           a fallback.

           The filename extension .sh is a special case: it implies posix, but may be overriden
           by a valid shell shebang.

       -p, --posix
           Shorthand for -ln=posix.

       -filename str
           Provide a name for the standard input file.

   Printer flags
       -i, --indent <uint>
           Indent: 0 for tabs (default), >0 for number of spaces.

       -bn, --binary-next-line
           Binary ops like && and | may start a line.

       -ci, --case-indent
           Switch cases will be indented.

       -sr, --space-redirects
           Redirect operators will be followed by a space.

       -kp, --keep-padding
           Keep column alignment paddings.

       -fn, --func-next-line
           Function opening braces are placed on a separate line.

   Utility flags
       -f, --find
           Recursively find all shell files and print the paths.

       --to-json
           Print syntax tree to stdout as a typed JSON.

       --from-json
           Read syntax tree from stdin as a typed JSON.

EXAMPLES

       Format all the scripts under the current directory, printing which are modified:

           shfmt -l -w .

       For CI, one can use a variant where formatting changes are just shown as diffs:

           shfmt -d .

       The following formatting flags closely resemble Google's shell style defined in
       <https://google.github.io/styleguide/shell.xml>:

           shfmt -i 2 -ci -bn

       Below is a sample EditorConfig file as defined by <https://editorconfig.org/>, showing how
       to set any option:

           [*.sh]
           # like -i=4
           indent_style = space
           indent_size = 4

           shell_variant      = posix # --language-variant
           binary_next_line   = true
           switch_case_indent = true  # --case-indent
           space_redirects    = true
           keep_padding       = true
           function_next_line = true  # --func-next-line

           # Ignore the entire "third_party" directory.
           [third_party/**]
           ignore = true

       shfmt can also replace bash -n to check shell scripts for syntax errors. It is more
       exhaustive, as it parses all syntax statically and requires valid UTF-8:

           $ echo '${foo:1 2}' | bash -n
           $ echo '${foo:1 2}' | shfmt >/dev/null
           1:9: not a valid arithmetic operator: 2
           $ echo 'foo=(1 2)' | bash --posix -n
           $ echo 'foo=(1 2)' | shfmt -p >/dev/null
           1:5: arrays are a bash feature

AUTHORS

       Maintained by Daniel Martí <mvdan@mvdan.cc>, who is assisted by other open source
       contributors. For more information and development, see <https://github.com/mvdan/sh>.

                                            2023-08-24                                   shfmt(1)