General :: Unset Or Get Rid Of A Bash Function?
Jun 19, 2010
If you set or export an environment variable in bash, you can unset it. If you set an alias in bash, you can unalias it. But there doesn't seem to be an unfunction.
Consider this (trivial) bash function, for example, set in a .bash_aliases file and read at shell initialization.
function foo () { echo "bar" ; }
How can I clear this function definition from my current shell? (Changing the initialization files or restarting the shell doesn't count.)
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Jun 16, 2010
This is related to http://superuser.com/questions/27376/why-does-my-ld-library-path-get-unset-launching-terminal, but a different set of symptoms.First, /usr/bin/screen is setuid as per the other question. Second, the default shell on this system is /bin/tcsh for various historical reasons, and we're not allowed to chsh to /bin/bash, so I typically run bash manually immediately after login. Third, I almost always use screen, but I want ctrl-a ctrl-c in screen to create a new bash "tab", so I always invoke bash first.
That is:
{~} $ echo $SHELL
/bin/tcsh
[code].....
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Jun 27, 2011
Code:
#loop until there are no more files
while [ ${#files[@]} -gt 0 ]; do
for num in `seq 1 ${#files[@]}`; do
wurd=`tail -4 ${files[$num-1]}`
[code].....
Everything works.. but when it has to unset.. it breaks.. it doesnt give an error though.. it just jams the program.
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Jun 8, 2011
I have trouble with using an alias inside aash function. I would like to ssh into multiple machines by executing:ssh machine To achieve this, I put something like the following into my ~/.bashrc:
alias machine='user@machine'
ssh()
{
[code]....
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Apr 24, 2010
I just wonder the distinction calling the function between $(one_function) and one_function in bash shell script.
When I set the variable PS1 in ~/.bashrc, I can't invoke the function by one_func
ex:
export PS1="
[e[31m] $(one_func) # it works
export PS1="
[e[31m] one_func # it doesn't work
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Jul 6, 2010
I have packer installed for AUR packages, but I want to be able to use the pacman command for both. I think I will need a function for this -- what I mean is that whenever I use pacman, it will try using packer and if that fails (invalid option) it will use pacman-color. It could also decide which program to use based on the arguments. I can't just use packer (alias pacman='sudo packer') because packer doesn't have some options like -R to remove packages. I want to always use it to install and upgrade packages however, because It can install from the default repositories as well as AUR.
Does someone know how to accomplish this, or could point me in the right direction? I'm new to bash scripting. error (e.g. pacman -V prints packer: Option '-V' is not valid.).
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Mar 17, 2010
i am dealing with this problemI have a function
function Une {
...
return $some_variable
[code]...
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Apr 9, 2010
I just started writing bash scripts and have a little question about the text editors. I now use gedit which I really like (don't like emacs for some reason), but I do miss some function for inserting/removing comment signs (in this case # for bash scripts) on a whole block of text. For example in Matlab you can simply mark a whole block and comment/uncomment all of it at once. Is this possible in gedit (via some plug-in or something?), or maybe in some other nice editor you can recommend?
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Jun 20, 2010
I looked on the net for such function or example and didin't find anything, thus after having made one i guess it would be legitimate to drop it to see what others thinks of it.
#!/bin/bash
addelementtoarray()
{
local arrayname=$1
[code]....
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Aug 6, 2010
I've got new version of grub from the newest linux. Do you know how to disable quiet booting ? Because I've got problem with my graphics card and to fix it I need recovery mode.
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May 2, 2011
I am trying to build a function inside a script.
Code:
#!/bin/sh
#System commands and other configurable.
IPT=/sbin/iptables
IP6T=/sbin/ip6tables
IPST=/usr/sbin/ipset
MODP=/sbin/modprobe
GET=/usr/bin/wget
INT_NET=192.168.1.0/24 .....
I can find lots of tutorials in how to use if, then, else. However, how do I define a variable inside the function?
SEE>>
Code:
for c in $ISO
Also, am I using the 'test' command correctly( -/+ week as valid test)?
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Nov 16, 2010
I wanted to make an alias with arguments (like in cshell) which is in bash done by functions. The function must simply perform a command (nedit), append the arguments from the cli and make it run in the background (adding &).
So here is the function in a naive attempt:
Code:
when using the command
Code:
Code:
How can i use arguments and still start it in background? In cshell it was like:
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Jan 23, 2011
I made a script that calls a function. However when I run the script I cannot get a value from the first parameter. Here is the function:
Code:
$cat function_library
_file_info()
{
if [ -e "$1" ]
then
[Code]....
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Oct 29, 2010
I have taken into count spacing of functions as a reason for not working. Can you get this function to work on your machine?
quickfind () { find . -maxdepth 2 -iname "*$1*" }
It does not print the retired output but find . -maxdepth 2 -iname "*$1*" does work. What is wrong?
quickfind () { f
ind . -maxdepth 2 -iname "*$1*" ; }
If I run this from the command line I don't get an error but no output? I am not running this inside a script but from the command line. I want to be able to run any function () from the command line. I have more functions that I can't get to work?
tt () { tree -pFCfa . | grep "$1" | less -RgIKNs -P "H >>> " }
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Apr 16, 2010
I have been working on this way too long now...this *should* be simple. I must be missing something simple at this point.
Code:
function f_is_ip()
{
if [ "`echo "$1" | /bin/egrep "[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}"`" != "" ] ## Error on this line
[Code]....
When I echo $1 ## prints 192.168.1.22
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Jun 15, 2011
I'm making a small script for searching and doing some operations with photos, but I'm kinda stuck on this little function:
Code:
function findallformat {
prefix=""
if [ $1 = -pre ] then
[code]....
That function should find for every file with a certain type; and you can specify a prefix using a "-pre" followed by the prefix that you want to search. The format should be "stackable", so you can use as many types that you want, without repeating the same function on the code.
Example: findallformat -pre IMG_ .JPG .CR2 #That should search files that start with "IMG_" and finishes with .JPG and .CR2. My problem it's that, when I try to use it on the script, it says "bash: syntax error near `token' unexpected `}'"
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Aug 8, 2010
I was wondering if possible in bash for a variable to take the value of a function, I mean the function returns a value and a variable will take it. example:
[Code]....
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Feb 4, 2011
I found a weather function for bash from searching google, and started to finesse it. This is what I have so far, any tips to finesse it even more?
Code:
# Based on code by Crouse at www.bashscripts.org
weather() {
declare -a WEATHERARRAY
WEATHERARRAY=('lynx -dump "[URL]?hl=en&lr=&client=firefox-a&rls=org.mozilla%3Aen-US%3Aofficial&q=weather+${1}&btnG=Search" | grep -A 18 -m 1 "Current:" | sed -e 's/^[ ]*//' | cut -d '|' -f 1-5 ')
echo Weather for the zipcode of $1:$'
' ${WEATHERARRAY[@] } }
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Aug 20, 2009
I want to set a key binding in bash for "history-search-backward" readline command to a combination of Control+some other key (I'm using 2 as an example), but I'm unable to do so. in fact, I'm unable to alter or add bindings to Control+key combinations.
After several tries my ~/.inputrc now looks like this
But it doesn't work and bind -p | grep "-2" gives nothing. If I try something without the control key:
I can search in the history by prssing the sequence C + - + 2.
bind -p gives control in C form, for example:
I've tried different formats in my inputrc:
But nothing works.
works if I press Escape followed by 2.
Setup:
Fedora 11:
Bash version 4.0.23(1)
GNU Readline 5.2 (according to the man page)
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Feb 21, 2010
the function terminates if no key is pressed for 10 consecutive seconds. I tried using the -t option as suggested in some forums, but my version of showkey doesn't have the option of changing the timeout. The options I get are:
-h --helpdisplay this help text
-a --asciidisplay the decimal/octal/hex values of the keys
-s --scancodesdisplay only the raw scan-codes
-k --keycodesdisplay only the interpreted keycodes (default).
Is it possible to write a script to use this function and still keep the function active until an interrupt is recieved?
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Feb 14, 2011
This should be a simple thing to accomplish, but I can seem to figure it out. Essentially, I want to have a bash alias or function that will let me recursively grep the current directory. A while back I added this to my .bashrc:
Code:
alias rg="grep -r --exclude=*/.svn/* --exclude=*.swp"
This works fine, (and also ignores any svn and vim swp files), and I can call it like:
Code:
rg foo *
However, 99.999% of the time, I am only interested in searching in the current directory, so the "*" is a bit redundant. Also, I would say 5-10% of the time, I am typing faster than thinking and forget the "*", so grep just sits there trying to read from stdin. It's a pretty minor thing, but ideally I'd like to be able to just type:
Code:
rg foo
I've tried creating a function to handle this:
Code:
function rg(){
grep -r --exclude=*/.svn/* --exclude=*.swp $1 *
}
but it behaves exactly the same as the alias above. escaping the "*" with 's doesn't work, and neither does trying `pwd` (or even a hard-coded path) in its place.
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Oct 28, 2009
Does anyone know if there is a way to "unset" processor affinity? So if you bind a process to just one proc, but then want to tell the OS to revert to normal behavior? Also, when you bind a process to a processor, can other processes use that process or does it have exclusive usage of that proc?
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May 21, 2010
I use my laptop through a proxy and at home I don't. I've set the proxy at uni using export http_proxy="...", as well as ftp and https proxies. Now I'm at home, I go to unset them by typing export http_proxy="" and that works, until I close and reopen terminalwhere "export" shows the proxy still set
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May 18, 2009
If a root user set an environment variable for users, how to let users not modify or unset the variable?
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Jan 25, 2011
For some reason it seems like my Thunderbird 3.x has a limit of 80 chars per line enabled, so when I edit a message, it puts a line feed on or before that limit.
I think it could be set when I installed Enigmail for using GPG, that changes some default values, but I'm not sure.
Anyway I would like to avoid this issue, so I can write lines as long as I want, but I've not found a configuration option to do this within "Preferences" dialog.
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Mar 23, 2009
I am using Firefox 1.5.0.9 in RHEL 5.0. I have a application which needs to load some jar files to the firefox browser, for which I am adding the path in LD_LIBRARY_PATH in ~/.bashrc.The issue is when I launch the firefox through a shortcut, the LD_LIBRARY_PATH is unset, and it just sets it to Firefox specific libs.Additionaly if I run firefox through command line it sets it perfectly fine, and appends the Firefox libs to the already set LD_LIBRARY_PATH.
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Sep 30, 2010
'readonly HISTFILE'
but the user could tamper with the histfile itself. Like:
rm -f $HISTFILE;
rm -f $HISTFILE; mkdir $HISTFILE;
rm -f $HISTFILE; ln -s /dev/null $HISTFILE;
I'm experimenting with PROMPT_COMMAND to execute a command each time the user executes a command and so log it somewhere else.This post was pruned from the 2009 Is there a way to prevent users from changing or unset their HISTFILE variable? thread. Please do not resurrect old threads but instead create your own (and maybe provide a link to the old one).
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Mar 24, 2011
I bought a multifunction stylus sx218 Espon model and I can not run the scanner function. I did some research and found a few solutions and very functional. I hope someone solves the problem. My version of openSUSE 11.2.
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Nov 16, 2010
Code:
#include <iostream>
using namespace std;
[code]...
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May 18, 2010
I am doing some Linux kernel programming for my research project. I need to record the timestamp (by using cpuid and rdtsc) when an interrupt handler (top half) is first invoked. Due to the time critical nature of the problem itself, I have to do the timestamping inside the interrupt handler itself (the first operation when the handler is called). However, I understand that tasks that are not so time critical should be deferred to a tasklet function (bottom half) for processing because other interrupts are disabled in a (top-half) interrupt handler. I am currently out of idea on how I can pass the timestamp information that I have obtained in the interrupt handler to the corresponding tasklet function.
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