Questions about bash only, as opposed to other Bourne/POSIX shells. For all Bourne/POSIX-style shells, use the /shell tag instead.
-1
votes
2answers
22 views
How to prevent symlink from creating within itself?
Running the following command works as expected, creating a symlink to src from include/bb:
ln -sf ../src include/bb
However, calling the same command again will cause an additional symlink to src ...
3
votes
2answers
21 views
show only physical disks when using df and mount
When I use df or mount, I'm most of all interested in physical disk partitions. Nowadays the output of those commands is overwhelmed by temporary and virtual filesystems, cgroups and other things I am ...
0
votes
2answers
139 views
Why we need to have 2>&1 in /dev/null 2>&1?
I saw in linux script there was a command argument > /dev/null 2>&1, I know it is to redirect the output to null, means silencing it. I also know about the numbering for 0,1,2 (STDIN, ...
1
vote
3answers
213 views
Creating a shell script inside a text editor
I want to know how to create a shell script inside a text editor.
So this is what I have inside the text editor.
#!/bin/bash
mkdir -p temp
cd temp
if [ $1 > $2 ] ;
then
echo $1
else
...
-3
votes
1answer
20 views
List the names of file with a certain permission only in the sub directories
So basically, I want to know how to list only the name of the sub directory that has a certain permission.
The command I got so far is this:
find */* -maxdepth 2 -perm 770
but this just gives me ...
0
votes
4answers
30 views
Difference between open file & open STDIN, when to use each [duplicate]
In very lot of answers, mainly about text-processing commands, I saw commands such as sed, awk, grep, among other, being used with STDIN and the simple open of a file
e.g.
$ sed -e 's|foo|bar|g' ...
0
votes
2answers
21 views
Alert notification
I wrote simple script which is running all the time and whenever the size of a file is changed it will write something like "The size has changed" to terminal but instead of terminal message, is it ...
0
votes
3answers
46 views
Creating a permanent variable
Is it possible to set "permanent variable" in shell? For example,
when I log in I want to print message "Hello user, this is your xxx log in"
The number of logins would be stored in permanent ...
1
vote
1answer
32 views
bash adds apostrophes to expanded variable
I am reading in a file inside my bash script where each line consists of multiple columns like this:
ANSIBLE 'first run' '--diff --extra-vars "client=yes fast=no"'
As you can see, the line consists ...
1
vote
1answer
27 views
How to bind “\C-;” in ~/.inputrc?
I use Meta-ijkl as arrows in Emacs, and M-; as a backspace, so I want to make the keys in bash represent the same style. Moving and deleting works well, but for some reason I cannot bind ...
0
votes
0answers
32 views
How to use df -h for only for path I am currently using for copy files and put the output to variable?
I am looking for a way to check the disk space only for partition which I am using to backup some folders and files to.
As an example:
I am in folder /var/usr/local/foo and I need to copy this ...
5
votes
1answer
39 views
Make bash exit != 0 when called by AWK and interrupted with ^C
I'm having an issue with the following piece of (G)AWK script:
do {
...
} while (system("sleep 10"))
My intention is to break the loop when the user presses ^C during the sleep, but it's not ...
0
votes
0answers
23 views
Adding source to PATH [on hold]
I want to location to my $PATH so i can execute scripts using only .name .
I added command
PATH="$PATH:$HOME/bin
export PATH
to profile.user file
when i print "$PATH" its located there.
I ...
1
vote
1answer
19 views
Get paths to all sd cards in a computer using GNU bash 4.3.11 running Ubuntu 14.04
how can I get the paths to all sd cards in a computer using GNU bash 4.3.11 running Ubuntu 14.04 and just those?
Background:
I have an .iso-file and want to create a bash script that asks the user ...
2
votes
1answer
26 views
Sourcing .bashrc from ssh after removing the prompt string check
I have a .bashrc file that needs to be sourced non-interactively. The problem is that on the file there is this return statement preventing from sourcing by code:
[ -z "$PS1" ] && return
...
