Run a command multiple times with different subcommands

echo apt-get\ {update,-y\ upgrade}\ \&\& true | sudo bash
it's nice to be able to use the command `ls program.{h,c,cpp}`. This expands to `ls program.h program.c program.cpp`. Note: This is a text expansion, not a shell wildcard type expansion that looks at matching file names to calculate the expansion. More details at http://www.linuxjournal.com/content/bash-brace-expansion I often run multiple commands (like apt-get) one after the other with different subcommands. Just for fun this wraps the whole thing into a single line that uses brace expansion.

1
2015-09-22 00:48:26

What Others Think

Brace-expansion's great. I use it all the time. Unfortunately your command's not a great example. It's a nightmare of escaped spaces and ampersands. . To be great it would have to be: * shorter than the expanded command * easy to remember * easy to type . Your command is equivalent to: echo 'apt-get update && apt-get -y upgrade && true' | sudo bash . Which can be shortened to: echo 'apt-get update && apt-get -y upgrade' | sudo bash Which can be made shorter still by using 'here string' redirection: sudo bash <<< 'apt-get update && apt-get -y upgrade' . Both forms are much clearer than the original. . The best command (IMHO) is the one you can type quickly and reliably.
flatcap · 216 weeks and 6 days ago
You are quite correct. However I did the use the word 'fun' rather than 'useful'. :-) I actually posted this in case it had other uses. I didn't realise you do string here documents. That's cool!
alecthegeek · 216 weeks and 6 days ago
I prefer flatcap's way. You should not uselessly echo with pipe when you can use
Tatsh · 216 weeks and 6 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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