On this page you find all important commands for the CLI tool cat. If the command you are looking for is missing please ask our AI.

cat

cat is a standard Unix utility that reads files sequentially, writing them to standard output. The name is derived from its function to (con)catenate files (from Latin catenare, "to chain"). It has been ported to a number of operating systems.

List of commands for cat:

- cat
ajson:tldr:d0404 ajson: Read JSON from `stdin` and execute a specified JSONPath expression.

$ cat ${filename-json} | ajson '${$--json[?(@-path)]}'

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- cat
aspell:tldr:00691 aspell: List misspelled words from standard input.

$ cat ${filename} | aspell list

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- cat
aspell:tldr:47bf9 aspell: List misspelled words from standard input and ignore words from personal word list.

$ cat ${filename} | aspell --personal=${personal-word-list-pws} list

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- cat
bzgrep:tldr:c4838 bzgrep: Search `stdin` for lines that do not match a pattern.

$ cat ${-path-to-bz-compressed-file} | bzgrep --invert-match "${search_pattern}"

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- cat
cat:tldr:0522f cat: Concatenate several files into an output file.

$ cat ${filename1 filename2 ---} > ${path-to-output_file}

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- cat
cat:tldr:1d41f cat: Copy the contents of a file into an output file without buffering.

$ cat -u ${-dev-tty12} > ${-dev-tty13}

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- cat
cat:tldr:346b1 cat: [n]umber all output lines.

$ cat -n ${filename}

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- cat
cat:tldr:4b4b4 cat: Display non-printable and whitespace characters (with `M-` prefix if non-ASCII).

$ cat -v -t -e ${filename}

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- cat
cat:tldr:f21eb cat: Append several files to an output file.

$ cat ${filename1 filename2 ---} >> ${path-to-output_file}

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- cat
egrep:tldr:7a42d egrep: Search `stdin` for a pattern.

$ cat ${filename} | egrep ${search_pattern}

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- cat
file_manipulation:warp:4ff5b Sort a file by line length

$ cat ${file_name} | awk '{ print length, $0 }' | sort -n -s | cut -d" " -f2-

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- cat
git-hash-object:tldr:ced42 git-hash-object: Compute the object ID from `stdin`.

$ cat ${filename} | git hash-object --stdin

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- cat
git-stripspace:tldr:3e6dc git-stripspace: Trim whitespace from a file.

$ cat ${filename} | git stripspace

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- cat
git-stripspace:tldr:52924 git-stripspace: Trim whitespace and Git comments from a file.

$ cat ${filename} | git stripspace --strip-comments

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- cat
gml2gv:tldr:45857 gml2gv: Convert a graph using `stdin` and `stdout`.

$ cat ${input-gml} | gml2gv > ${output-gv}

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- cat
graphml2gv:tldr:cc563 graphml2gv: Convert a graph using `stdin` and `stdout`.

$ cat ${input-gml} | graphml2gv > ${output-gv}

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- cat
grep:tldr:cc5bb grep: Search `stdin` for lines that do not match a pattern.

$ cat ${filename} | grep --invert-match "${search_pattern}"

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- cat
gunzip:tldr:b255c gunzip: Decompress an archive from `stdin`.

$ cat ${path-to-archive-gz} | gunzip

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- cat
gv2gml:tldr:67165 gv2gml: Convert a graph using `stdin` and `stdout`.

$ cat ${input-gv} | gv2gml > ${output-gml}

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- cat
gv2gxl:tldr:4995c gv2gxl: Convert a graph using `stdin` and `stdout`.

$ cat ${input-gv} | gv2gxl > ${output-gxl}

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- cat
gxl2gv:tldr:2fb6e gxl2gv: Convert a graph using `stdin` and `stdout`.

$ cat ${input-gxl} | gxl2gv > ${output-gv}

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- cat
http:tldr:5131c http: Specify raw request body via `stdin`.

$ cat ${data-txt} | http PUT ${example-org}

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- cat
httprobe:tldr:32308 httprobe: Probe a list of domains from a text file.

$ cat ${input_file} | httprobe

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- cat
httprobe:tldr:8d8ad httprobe: Probe additional ports with a given protocol.

$ cat ${input_file} | httprobe -p ${https:2222}

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- cat
httprobe:tldr:e29d6 httprobe: Only check for HTTP if HTTPS is not working.

$ cat ${input_file} | httprobe --prefer-https

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- cat
in2csv:tldr:a04a5 in2csv: Pipe a JSON file to in2csv.

$ cat ${data-json} | in2csv -f json > ${data-csv}

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- cat
jello:tldr:00951 jello: Pretty-print JSON or JSON-Lines data from `stdin` to `stdout`.

$ cat ${file-json} | jello

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- cat
jello:tldr:11dbe jello: Output all elements from arrays (or all the values from objects) in JSON or JSON-Lines data from `stdin` to `stdout`.

$ cat ${file-json} | jello -l

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- cat
jello:tldr:1a000 jello: Output the value of a given key to a string (and disable JSON output).

$ cat ${file-json} | jello -r '"${some text}: " + _.${key_name}'

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- cat
jello:tldr:33ed9 jello: Output the value of multiple keys as a new JSON object (assuming the input JSON has the keys `key_name` and `other_key_name`).

$ cat ${file-json} | jello '{"${my_new_key}": _.${key_name}, "${my_other_key}": _.${other_key_name}}'

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- cat
jello:tldr:4a099 jello: Output the first element in JSON or JSON-Lines data from `stdin` to `stdout`.

$ cat ${file-json} | jello _[0]

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- cat
jello:tldr:5cc94 jello: Output a schema of JSON or JSON Lines data from `stdin` to `stdout` (useful for grep).

$ cat ${file-json} | jello -s

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- cat
jello:tldr:b9cf0 jello: Output the value of a given key of each element in JSON or JSON-Lines data from `stdin` to `stdout`.

$ cat ${file-json} | jello '[i.${key_name} for i in _]'

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- cat
jtbl:tldr:0c626 jtbl: Print a table and specify the column width for wrapping.

$ cat ${file-json} | jtbl --cols=${width}

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- cat
jtbl:tldr:14b38 jtbl: Print a table and truncate rows instead of wrapping.

$ cat ${file-json} | jtbl -t

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- cat
jtbl:tldr:18569 jtbl: Print a table from JSON or JSON Lines input.

$ cat ${file-json} | jtbl

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- cat
jtbl:tldr:d0b60 jtbl: Print a table and don't wrap or truncate rows.

$ cat ${file-json} | jtbl -n

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- cat
kate:tldr:85c4c kate: Create a file from `stdin`.

$ cat ${filename} | kate --stdin

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- cat
linux:file:length Return the number of lines of a given file.

$ cat ${filename} | wc -l

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- cat
linux:linux:file:show Show the content of a file.

$ cat ${filename}

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- cat
linux:version:info Show information about the Linux version

$ cat /etc/os-release

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- cat
llvm-as:tldr:5a295 llvm-as: Read an IR file from `stdin` and assemble it.

$ cat ${path-to-source-ll} | llvm-as -o ${path-to-out-bc}

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- cat
llvm-bcanalyzer:tldr:b8f20 llvm-bcanalyzer: Read a Bitcode file from `stdin` and analyze it.

$ cat ${filename-bc} | llvm-bcanalyzer

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- cat
mm2gv:tldr:3a9dd mm2gv: Convert a graph using `stdin` and `stdout`.

$ cat ${input-mm} | mm2gv > ${output-gv}

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- cat
mpg123:tldr:3c26e mpg123: Play the mp3 from `stdin`.

$ cat ${file-mp3} | mpg123 -

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- cat
nl:tldr:1ffad nl: Read from standard output.

$ cat ${filename} | nl ${options} -

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- cat
nms:tldr:3babe nms: Decrypt the content of a file, with a custom output color.

$ cat ${filename} | nms -a -f ${select}

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- cat
parallel:tldr:86451 parallel: Break `stdin` into ~1M blocks, feed each block to `stdin` of new command.

$ cat ${big_file-txt} | parallel --pipe --block 1M ${command}

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- cat
perl:tldr:d4051 perl: Run a regular [e]xpression on `stdin`, printing matching [l]ines.

$ cat ${filename} | perl -n -l -e 'print if /${regular_expression}/'

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- cat
perl:tldr:f3210 perl: Run a regular [e]xpression on `stdin`, printing only the first capture group for each matching [l]ine.

$ cat ${filename} | perl -n -l -e 'print $1 if /${before}(${regular_expression})${after}/'

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- cat
pngcheck:tldr:5b897 pngcheck: Receive an image from `stdin` and display detailed information.

$ cat ${path-to-image-png} | pngcheck -cvt

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- cat
pup:tldr:1100e pup: Print all text from the filtered HTML elements and their children.

$ cat ${index-html} | pup '${div} text{}'

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- cat
pup:tldr:49a24 pup: Print HTML as JSON.

$ cat ${index-html} | pup '${div} json{}'

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- cat
pup:tldr:58997 pup: Transform a raw HTML file into a cleaned, indented, and colored format.

$ cat ${index-html} | pup --color

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- cat
pup:tldr:8575a pup: Filter HTML by element tag name.

$ cat ${index-html} | pup '${tag}'

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- cat
sponge:tldr:6b029 sponge: Append file content to the source file.

$ cat ${filename} | sponge -a ${filename}

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- cat
textql:tldr:6bc5e textql: Read data from `stdin`.

$ cat ${filename} | textql -sql "${SELECT * FROM stdin}"

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- cat
tlmgr-key:tldr:c33bb tlmgr-key: Add a key from `stdin`.

$ cat ${path-to-key-gpg} | sudo tlmgr key add -

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- cat
ts:tldr:442f8 ts: Convert existing timestamps in a text file (eg. a log file) into [r]elative format.

$ cat ${filename} | ts -r

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- cat
unzipsfx:tldr:510f2 unzipsfx: Create a self-extracting binary file of a `zip` archive.

$ cat unzipsfx ${path-to-archive-zip} > ${filename} && chmod 755 ${filename}

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- cat
vale:tldr:89b99 vale: Check the style from `stdin`, specifying markup format.

$ cat ${file-md} | vale --ext=.md

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- cat
xauth:tldr:8a61e xauth: Merge the authorization entries from a specific file into the authorization database.

$ cat ${filename} | xauth merge -

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- cat
xml-depyx:tldr:17600 xml-depyx: Convert a PYX document from `stdin` to XML format.

$ cat ${path-to-input-pyx} | xml depyx > ${path-to-output-xml}

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- cat
xml-format:tldr:c7315 xml-format: Format an XML document from `stdin`, removing the `DOCTYPE` declaration.

$ cat ${path\to\input-xml} | xml format --dropdtd > ${path-to-output-xml}

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- cat
xml-pyx:tldr:35ca1 xml-pyx: Convert an XML document from `stdin` to PYX format.

$ cat ${path-to-input-xml} | xml pyx > ${path-to-output-pyx}

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- cat
xsel:tldr:9eff6 xsel: Use the contents of a file as input of the clipboard.

$ cat ${filename} | xsel -ib

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- cat
zek:tldr:1c7c0 zek: Generate an example Go program from a given XML from `stdin` and send output to a file.

$ cat ${path-to-input-xml} | zek -p -o ${path-to-output-go}

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- cat
zek:tldr:90ae2 zek: Generate a Go struct from a given XML from `stdin` and display output on `stdout`.

$ cat ${path-to-input-xml} | zek

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