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137
votes
10answers
12k views

In Bash, when to alias, when to script, and when to write a function?

It's taken me almost 10 years of Linux usage to ask this question. It was all trial and error and random late-night internet surfing. But people shouldn't need 10 years for this. If I were just ...
18
votes
1answer
1k views

Aliases vs functions vs scripts

This site says, "Shell functions are faster [than aliases]. Aliases are looked up after functions and thus resolving is slower. While aliases are easier to understand, shell functions are preferred ...
9
votes
4answers
2k views

Executing user defined function in a find -exec call

I'm on Solaris 10 and I have tested the following with ksh (88), bash (3.00) and zsh (4.2.1). The following code doesn't yield any result: function foo { echo "Hello World" } find somedir -exec ...
8
votes
3answers
327 views

Running an executable in PATH with the same name as an existing function

Sometimes I define a function that shadows an executable and tweaks its arguments or output. So the function has the same name as the executable, and I need a way how to run the executable from the ...
19
votes
4answers
919 views

difference between function foo() {} and foo() {}

I can define bash functions using or omitting the function keyword. Is there any difference? #!/bin/bash function foo() { echo "foo" } bar() { echo "bar" } foo bar Both calls to functions ...
1
vote
4answers
2k views

how can i use sudo within a function?

i have written a function which acts in a similar way to tee but also pre-pends a datestamp. everything works fine except when i want to output to a file which is only root writeable (in my case a ...
5
votes
2answers
367 views

How can I create a function in zsh that calls an existing command with the same name?

How can I write a function in zsh that invokes an existing command with the same name as the function itself? For example, I've tried this to illustrate my question: function ls { ls -l $1 $2 $3 ...