Bash Expansion: Difference between revisions
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(Created page with "Bash brace expansion "autofills" some commands for you. == Create Multiple files == <code>touch file{1,2,3,4}.txt</code> - Expands to: <pre> file1.txt file2.txt file3.t...") |
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== Save Typing == | |||
<code>/a/long/path/{foo,bar}</code> expands to: <code>/a/long/path/foo /a/long/path/bar</code> (Handy for copy commands...) | |||
'''Make a backup copy of a file:'''<br /> | |||
<code>cp -a /home/user/public_html/test.txt{,.bak}</code> - is the same as typing: <code>cp -a /home/user/public_html/test.txt /home/user/public_html/test.txt.bak</code> | |||
== References == | |||
<ul> | |||
<li>[http://www.devopsservice.com/bash-brace-expansion-tutorial devopservice tutorial]</li> | |||
</ul> | |||
Latest revision as of 03:54, 15 July 2017
Bash brace expansion "autofills" some commands for you.
Create Multiple files
touch file{1,2,3,4}.txt - Expands to:
file1.txt file2.txt file3.txt file4.txt
So, we can use a comma to separate the stuff we want to expand. Can we do ranges, I don't want to type all that?
We sure can!!
touch file{1..6}.txt - Expands to:
file1.txt file2.txt file3.txt file4.txt file5.txt file6.txt
Save Typing
/a/long/path/{foo,bar} expands to: /a/long/path/foo /a/long/path/bar (Handy for copy commands...)
Make a backup copy of a file:
cp -a /home/user/public_html/test.txt{,.bak} - is the same as typing: cp -a /home/user/public_html/test.txt /home/user/public_html/test.txt.bak