Unexpand: Difference between revisions

unexpand
Operating system	Unix and Unix-like
Platform	Cross-platform
Type	Command

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Latest revision as of 01:44, 29 May 2024

unexpand is a command in Unix and Unix-like operating systems. It is used to convert groups of space characters into tab characters.^[1]

For example:

$ echo "                 asdf sdf" | unexpand | od -c
0000000  \t  \t       a   s   d   f       s   d   f  \n
0000014
$ echo "                 asdf sdf" | od -c
0000000
0000020       a   s   d   f       s   d   f  \n
0000032

Here the echo command prints a string of text that includes multiple consecutive spaces, then the output is directed into the unexpand command. The resulting output is then displayed by the octal dump command od. At the second prompt, the same echo output is sent directly through the od command. As can be seen by comparing the two, the unexpand program converts sequences of eight spaces into single tabs (printed as '\t').

References[edit]

^ "unexpand - Compress spaces into tabs". www.ibm.com. Retrieved 2024-05-09.

External links[edit]

[1] The program's manpage

[1] "unexpand - Compress spaces into tabs". www.ibm.com. Retrieved 2024-05-09.

[1]

@@ Line 1: / Line 1: @@
+{{lowercase}}
-'''unexpand''' is a command in the [[Unix|UNIX Operating System]]. It is used to convert groups of space [[character (computing)|character]]s into [[tab]]s.
+{{Infobox software
+| name                   = unexpand
+| logo                   =
+| screenshot             =
+| screenshot size        =
+| caption                =
+| author                 =
+| developer              =
+| released               =
+| latest release version =
+| latest release date    =
+| operating system       = [[Unix]] and [[Unix-like]]
+| platform               = [[Cross-platform]]
+| genre                  = [[Command (computing)|Command]]
+| license                =
+| website                =
+}}
+'''unexpand''' is a command in [[Unix]] and [[Unix-like]] [[operating system]]s. It is used to convert groups of space [[character (computing)|character]]s into [[tab character]]s.<ref>{{Cite web |title=unexpand - Compress spaces into tabs |url=https://www.ibm.com/docs/en/zos/2.4.0?topic=descriptions-unexpand-compress-spaces-into-tabs |access-date=2024-05-09 |website=www.ibm.com |language=en-us}}</ref>
 For example:
+<syntaxhighlight lang="console">
- $ echo "                 asdf sdf" | unexpand | od -c
- 0000000  \t  \t       a   s   d   f       s   d   f  \n
+$ echo "                 asdf sdf" | unexpand | od -c
+0000000  \t  \t       a   s   d   f       s   d   f  \n
- 0000014
+0000014
- $ echo "                 asdf sdf" | od -c
+$ echo "                 asdf sdf" | od -c
- 0000000
+0000000
- 0000020       a   s   d   f       s   d   f  \n
+0000020       a   s   d   f       s   d   f  \n
- 0000032
+0000032
+</syntaxhighlight>
-Here the [[echo]] command prints a string of text that includes multiple consecutive spaces, then the output is directed into the '''unexpand''' command. The resulting output is then displayed by the [[octal]] dump command [[od]]. At the second prompt, the same echo output is sent directly through the '''od''' command. As can be seen by comparing the two, the '''unexpand''' program converts sequences of eight spaces into single tabs (printed as '\t').
+Here the [[Echo (command)|echo command]] prints a string of text that includes multiple consecutive spaces, then the output is directed into the '''unexpand''' command. The resulting output is then displayed by the [[octal]] dump command [[Od (Unix)|od]]. At the second prompt, the same echo output is sent directly through the '''od''' command. As can be seen by comparing the two, the '''unexpand''' program converts sequences of eight spaces into single tabs (printed as '\t').
+==See also==
-[[Category:Unix programs]]
+*[[List of Unix commands]]
+*[[Expand (Unix)]]
+==References==
+{{Reflist}}
+==External links==
+*[https://web.archive.org/web/20051031053512/http://www.linuxmanpages.com/man1/unexpand.1.php] The program's [[manpage]]
+{{Unix commands}}
+{{Core Utilities commands}}
+[[Category:Unix SUS2008 utilities]]

v t e Unix command-line interface programs and shell builtins
File system	cat chattr chmod chown chgrp cksum cmp cp dd du df file fuser ln ls mkdir mv pax pwd rm rmdir split tee touch type umask
Processes	at bg crontab fg kill nice ps time
User environment	env exit logname mesg talk tput uname who write
Text processing	awk basename comm csplit cut diff dirname ed ex fold head iconv join m4 more nl paste patch printf read sed sort strings tail tr troff uniq vi wc xargs
Shell builtins	alias cd echo test unset wait
Searching	find grep
Documentation	man
Software development	ar ctags lex make nm strip yacc
Miscellaneous	bc cal expr lp od sleep true and false
Categories Standard Unix programs Unix SUS2008 utilities List

v t e GNU Core Utilities command-line interface programs
File system	chcon chmod chown chgrp cksum cp dd df dir dircolors install ln ls mkdir mkfifo mknod mktemp mv realpath rm rmdir shred sync touch truncate vdir
Text utilities	b2sum base32 base64 cat cksum comm csplit cut expand fmt fold head join md5sum nl numfmt od paste ptx pr sha1sum shuf sort split sum tac tail tr tsort unexpand uniq wc
Shell utilities	arch basename chroot date dirname du echo env expr factor false groups hostid id link logname nice nohup nproc pathchk pinky printenv printf pwd readlink runcon seq sleep stat stdbuf stty tee test timeout true tty uname unlink uptime users who whoami yes

Latest revision as of 01:44, 29 May 2024

See also[edit]

References[edit]

External links[edit]