02-28-2009
Quote:
Originally Posted by
victorbrca
Anyone knows what would be the cons and pros of adding a script in ~/bin vs. a function in ~/.bashrc?
Scripts take longer to execute (it requires forking and execing a new process), and they cannot change anything in your current environment unless you source them. Functions are run in the current shell.
Quote:
I'm not sure how the system keeps tracks of some of the settings loaded in ~/.bashrc (like functions and aliases).
Variables are local to the current shell unless they are exported.
In bash, functions may be exported so they are available to any commands you call.
Aliases are local to the current shell. I don't use them at all. As it says in the nash man page, "For almost every purpose, aliases are superseded by shell functions."
Quote:
Would I be right in thinking that this would all be loaded into memory and might slow down the system if I go "function" crazy?
I have more than 100 functions loaded; I don't notice any slowdown.
Quote:
Should I add only small functions in ~/.bashrc and keep bigger scripts in ~/bin?
Not necessarily.
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shells(4) File Formats shells(4)
NAME
shells - shell database
SYNOPSIS
/etc/shells
DESCRIPTION
The shells file contains a list of the shells on the system. Applications use this file to determine whether a shell is valid. See getuser-
shell(3C). For each shell a single line should be present, consisting of the shell's path, relative to root.
A hash mark (#) indicates the beginning of a comment; subsequent characters up to the end of the line are not interpreted by the routines
which search the file. Blank lines are also ignored.
The following default shells are used by utilities: /bin/bash, /bin/csh, /bin/jsh, /bin/ksh, /bin/pfcsh, /bin/pfksh, /bin/pfsh, /bin/sh,
/bin/tcsh, /bin/zsh, /sbin/jsh, /sbin/sh, /usr/bin/bash, /usr/bin/csh, /usr/bin/jsh, /usr/bin/ksh, /usr/bin/pfcsh, /usr/bin/pfksh,
/usr/bin/pfsh, and /usr/bin/sh, /usr/bin/tcsh, /usr/bin/zsh. Note that /etc/shells overrides the default list.
Invalid shells in /etc/shells may cause unexpected behavior (such as being unable to log in by way of ftp(1)).
FILES
/etc/shells lists shells on system
SEE ALSO
vipw(1B), ftpd(1M), sendmail(1M), getusershell(3C), aliases(4)
SunOS 5.10 4 Jun 2001 shells(4)