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Flag Counter
  2. World Encyclopedia
  3. expand (Unix) - Wikipedia
expand (Unix) - Wikipedia
From Wikipedia, the free encyclopedia
expand
Operating systemUnix and Unix-like
PlatformCross-platform
TypeCommand

expand is a shell command that converts tab characters to space characters while maintaining vertical alignment. Originally, developed for Unix and standardized by POSIX, it is available on many operating systems today.[1] The command is available as a separate package for Windows via UnxUtils.[2]

In the following commands, the echo command prints a string of text that includes a tab character, then the output is directed into expand. The resulting output is displayed in hexadecimal and as characters by xxd (dump). At the second prompt, the same echo output is sent directly to xxd. As shown, expand converts the tab (specified as '\t') into spaces. 

$ echo -e "foo\tbar" | expand | xxd -g 1 -u
0000000: 66 6F 6F 20 20 20 20 20 62 61 72 0A              foo     bar.
$ echo -e "foo\tbar" | xxd -g 1 -u
0000000: 66 6F 6F 09 62 61 72 0A                          foo.bar.

See also

References

  1. ^ "expand". The Open Group Base Specifications. The Open Group. Retrieved 27 April 2023.
  2. ^ "Native Win32 ports of some GNU utilities". unxutils.sourceforge.net.
Sunting pranala
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