1
vote
1answer
38 views

bash completion on posix mode

I would like to use an interactive posix bash shell but the autocompletion feature doesn't work. When i type the tab character it simply prints a tab. The tab completion only works when i'm on a non ...
0
votes
1answer
47 views

bash completion on posix mode [duplicate]

I would like to use an interactive posix bash shell but the autocompletion feature doesn't work. When i type the tab character it simply prints a tab. The tab completion only works when i'm on a non ...
5
votes
1answer
188 views

Where is $_ defined by POSIX?

In the comments to the accepted answer to this Unix & Linux StackExchange question, it is stated that $_ is "one of only some 7 special parameters defined by POSIX". I can't find that definition ...
0
votes
2answers
76 views

What does the `set $variable` do?

I know that set is used to manipulate environment variables, but I want to make myself sure - these alterations are not permanent, right? I mean once I close shell and reopen it, no changes will be ...
3
votes
1answer
171 views

Using shell's read command with live editing functionality (readline like)

Is there a standard (POSIX) way of asking the user some data from within a shell script, with read for example, while allowing live edition of the text being typed (what readline does)? I know bash ...
0
votes
0answers
39 views

Rvm posix error on arm Beagle bone black

I'm trying to run rvm on Angstrom linux on BBB. When I try to launch rvm, I obtain: RVM can not be run with `set -o posix`, please turn it off and try again. Someone know about this?
19
votes
4answers
1k 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
1answer
362 views

What is difference between POSIX and bash and other shell scripts?

While going through many answers on Unix.SE, I come across many of them writing their contents w.r.t to Posix or Bash or some other standard. I know of some differences like some have arrays and some ...
6
votes
2answers
253 views

What is difference between [ and [[ in BASH? [duplicate]

Possible Duplicate: using single or double bracket - bash When should I use a single bracket? [ When should I use double brackets? [[ Are both POSIX compliant?
5
votes
4answers
750 views

Is there a difference between these two commands?

cat a > b and cp a b If they are functionally the same for all intents and purposes, which one is faster?
0
votes
1answer
630 views

POSIX and Bash, sh shorthand, for compound if statement

I prefer to do my sh commands in shorthand, And I prefer to be in POSIX. Truthfully, if the script can run on Dash, that is good enough. Which means using the test command [, not the extended [[. I ...