Questions tagged [bash-scripting]
Bash scripting is making scripts in the Bash shell language.
775
questions
0
votes
1answer
25 views
<command> is a function. How to find where it is defined?
In Linux Terminal I have a command that I will call pippo
#> pippo parameters
...command executed
If I call
#> which pippo
Nothing is shown. If I try type pippo, instead, I get:
#> type ...
1
vote
0answers
20 views
Bash Tab expansion to list all executables based on regex
How can I use regex based methods to find commands available in the ${PATH}?
For example when I press w and Tab switch. I get a list of all commands starting with w. I would like to list all ...
0
votes
1answer
59 views
give certificate(not the file) as input to openssl command in bash script
is there any way to give certificate(not the file) as input to openssl command in bash script ?
I placed ascii form of certicate in script as a variable . when I want to read it by openssl I got error ...
0
votes
3answers
66 views
Swap content of two the same capacity drives
I have two the same capacity drives (equal to 1 byte). I need to swap their content (one is QVO, other one is EVO, but the selection of their application was mistaken).
Is it possible to do that by ...
1
vote
1answer
28 views
Pass arguments with pipe in bash
How can I pass arguments with a pipe into the next command?
Here is my command:
USER_EMAIL="email@gmail.com"
echo "SomePassword" | python manage.py init_admin --email=$USER_EMAIL --password= $1
...
1
vote
1answer
29 views
Ignore files with a specific pattern in a bash script
I am trying to ignore filenames starting with 33266158I since these files are empty and don't need any processing. I have just pasted the part where I am ignoring the file.
But this does not work and ...
0
votes
0answers
15 views
Error installing glog CocoaPod “configure: error: C preprocessor ”/lib/cpp“ fails sanity check”
When running pod install I am getting an error "configure: error: C preprocessor "/lib/cpp" fails sanity check"
It seems like my bash shell itself has an issue with location of clang/gcc. If I run ./...
0
votes
1answer
30 views
Setting and using a variable within a single-line Expect command in a Bash script
I have an array, $HOSTS, which contains a set of hostnames.
I have a database table that has a set of IP addresses. I want to go through each IP address in that table and send a command (hostname -s) ...
0
votes
0answers
10 views
External keyboard startup script
I want to have a script in my Autostart that sets the keyboard layout according to if there is an external keyboard connected or not. Is there an elegant way to do this? I'm on Manjaro.
0
votes
0answers
44 views
Why does the value of $HOME vary between Ubuntu 18.04 & 20.04 in a script using sudo
On Windows 10 v1909, I am using WSL (Ubuntu 18.04 & 20.04: 4.4.0-18362-Microsoft x86_64 GNU/Linux) and I noticed the value of $HOME within an arbitrary script varies between Ubuntu 18.04 and 20.04 ...
0
votes
1answer
41 views
./jmap command works when script is run manually but fails when run as cronjob
I have a fairly simple script written for calculating heap size and it uses ./jmap.
The script first finds the process id and saves it in a variable PID. The same PID is given as a variable in the ...
0
votes
1answer
19 views
notify-send Works From Shell Session, Not From Script
I am using at in coordination with notify-send/dunst as a form of reminders for myself. In an interactive bash session, doing:
$ echo 'notify-send "Test"' | at 12:45PM
works just fine and I see the ...
1
vote
0answers
43 views
How to get playlist name(title) with youtube-dl
I have an issue with youtube-dl in Linux, so I want to create a bash
script letting me download a playlist and put all the videos in a
separate folder having the name of that playlist
here is my ...
0
votes
0answers
26 views
Set individual password timeout on sudo command
I have a long running script which runs as normal user then then has sudo make install towards the end which (if I don't notice it finishes within 5 minutes) times out and fails.
In man sudoers it ...
0
votes
2answers
36 views
Script for replacing the file name if it exists?
I'm trying to make a script that changes the name of the file if the file already exists to something like file1.txt, but I keep getting the same error: Syntax error: unexpected end of file So far I ...
1
vote
1answer
73 views
Getting PID of MPlayer (without filtering all processes or loosing keyboard control)
I'm frequently running some kids show, while I work. To do that, I need to extend screen to tv, change audio sink etc. AND move mplayer window from primary screen to desired + make that window sticky. ...
0
votes
0answers
13 views
How to start multiple PuTTY sessions from a bash script? [duplicate]
PuTTY can be started from the CLI / bash script (see the SSH.COM docu or the docu on documentation.help):
putty -load "my session name"
or
putty @my session name
Now I want to start multiple ...
1
vote
0answers
10 views
is it possible to enable WPS to connect to WiFi in Windows 10 using a script?
Is there any way to connect to WiFi by enabling the WPS method, for example, from the cmd in Windows 10? I'd like to automate it in a script.
0
votes
1answer
43 views
I can't get echo output from the shell code
I am more new to shell programming and I am encountering such an error. Why does it give such an error?
can you please tell me?
#!/bin/bash
echo ""
echo -e " _ _ _ _ _ _"
...
1
vote
1answer
17 views
Applying -lt on string variables in bash
I am new to bash scripting. I have to compare two values here, $i and $cdsStart: check if $i is lesser than $cdsScript, below is my code for doing the same.
inputFile="$1"
while read -r ...
4
votes
1answer
263 views
Add a new element to existing JSON array
How can I add "arn:aws:iam::xxxxxxx:role/3" line below "arn:aws:iam::xxxxxxx:role/2" adding a comma after "arn:aws:iam::xxxxxxx:role/2",.
Before:
{
"Version": "2012-10-17",
"Statement": [
{
...
0
votes
1answer
89 views
Trying to list attributes in bash 4 by nested for loops
This is going to be difficult to explain but I am going to give it a shot. This snippit is working in bash 5.0.16 but not 4.2.46
I have an array basicHosts=(host1 host2 host3) this is a dynamically ...
0
votes
1answer
51 views
Use a variable that could contain special characters into sed?
I have a bash script that'll take any word passed to it as a parameter and then encrypt the word using an openssl command. From there I want to take the returned string and use sed to write it into ...
1
vote
1answer
54 views
Using URLs as argument for command and for output file name
Im trying to use either XARGS or FOR in a single line to accept a list of URLS as arguments, this fails since a file name can't be a URLs. We tried doing this with FOR and XARGS, but it fails:
$for i ...
3
votes
2answers
302 views
Test condition in if command
Any idea why echo statement is being executed in both scenarios?
Outputs it worked:
#!/bin/bash
rizwan=''
if [ -n $rizwan ]; then
echo "it worked"
fi
Replace -n with -z, and it outputs it worked ...
0
votes
1answer
66 views
trouble with spaces in environment variable in rsync script on MacOS
I have a Bash script that I plan to run for daily backups (my HOME is /Volumes/Norman Data/me):
#!/bin/bash
# Halt the script on any errors.
set -e
# Remote server where
remote_server="example.com"
...
0
votes
1answer
27 views
How to pass % as param in windows command line
I'm trying to login to a server where my password contains % char.
this is what I'm trying to execute via myscript.bat which has a line net.exe use x: \\SERVER_IP\C$ /user:%USERNAME% n%5Ar!33
while I ...
0
votes
1answer
46 views
variable in bash scripting
Can someone explain why we require $ Sign in 3rd Command.
Why without dollar it is not working
[kony@HOSTNAME test]$ var1=1
[kony@HOSTNAME test]$ var1=[ var1 + 1 ]
bash: var1: command not found...
[...
28
votes
1answer
3k views
What is <<!END in a Bash script?
Consider:
#!/bin/bash
/u01/app/oracle/middleware/oracle_common/common/bin/wlst.sh <<!END
connect('user','pw');
p=redeploy('application');
p.printStatus();
exit();
!END
The above script is ...
0
votes
1answer
31 views
SED failing, why?
Also see: String manipulation - get part after a certain word
My script:
# get list of curent possible F2B 'get' options, as a array (omitting the 'action..') ..
f2b_opts_cmd="$(sudo ...
1
vote
1answer
95 views
Get bash to respect quotes when word splitting subshell output
I have a command that outputs some parameters that I want to pass to another command. However, when I run the command in a subshell, the output is subject to word splitting unless I quote the whole ...
0
votes
1answer
29 views
Bash: How can i send one mail instead of multiple mails
I am learning shell scripting and i was stuck at sending an email.
here in below code i am using conditions to check the files size if it is greater than 0 bytes then send an email.
if [ -s file1 ]
...
0
votes
0answers
26 views
bash: reading array and displaying it
how can I get the array values from the variable emailFailures.
please help me on this. Thank you.
#!/bin/ksh
MY_WORK='/a585/app/data/CCN_text'
raw_data_file_count=`ls -l raw_data_*|wc -l`
echo " $...
0
votes
1answer
43 views
Setting a variable name to output off command
I am new to writing of bash scripts. I am making a pipeline for bioinformatic data-analysis. I am running several program fx Porechop, where I want to set a variable in the output name. So I want to ...
3
votes
1answer
129 views
How does this find state actually work in moving a file up one directory?
Can someone explain how the string manipulation in this find statement actually works? My head is about to explode trying to figure it out. :-o
From: UNIX shell scripting: how to recursively move ...
0
votes
0answers
33 views
How does a “passwd” and “adduser” command actually work on a LINUX OS?
(From a novice's point of view)
The other day I was thinking about how a typical "passwd" command works in a LINUX OS. For example, when we type in "passwd", a prompt appears letting us type in our ...
1
vote
2answers
33 views
Unable to preserve a multi-word argument surrounded by double-quotes as a single argument in a Bash function
I've been stuck on this issue around variable expansion in Bash scripts where a multi-word argument surrounded by spaces is getting split into multiple arguments when passed down a chain of functions.
...
0
votes
1answer
71 views
how to get a value from array in bash
In the below i am checking the exit status , if it is not zero(which is a failure) i am displaying it by echo statment
while read -r record
reccount=$((reccount + 1 ))
/usr/bin/java -jar ...
0
votes
1answer
41 views
how to count the number of occurrences of a word in different files? -BASH
I have files like
raw_data_0, raw_data_1... raw_data_7
every file contains below data
record_count=1
emailCountFailure=0
record_count=1
emailCountFailure=0
record_count=1
emailCountFailure=0
...
0
votes
1answer
32 views
How to run a process in background, after getting a user input in bash shell
#!/bin/bash
set -e
INPUT_NO_OF_PROCESS=$1
NO_OF_PROCESS="${INPUT_NO_OF_PROCESS:-1}"
#mkdir -p $DUMP_DIR
echo "Spawning processes=$NO_OF_PROCESS"
for i in $(seq 1 $NO_OF_PROCESS)
do
# This ...
0
votes
0answers
16 views
Server is unreachable when starting from xterm
I have a bash script which starts a socket.io server in a new xterm window.
It also starts 2 clients both in new windows. When the clients do the handshake with the server they receive a bad request ...
0
votes
2answers
112 views
Bash- Return a value from child process to parent
I am using the below code
record_count=0
task()
{
while read -r record ; do
record_count=$(( record_count + 1 ))
.....
done < $1
}
for i in {1..5}; do
task $i &
done
how can i use the ...
0
votes
2answers
34 views
How to compare current password with new password mac - dscl
I am writing a script to change the admin password on all of our macs.
Its a =basic script, but I would like to check if the password is already correct before attempting to change it:
if [ ...
0
votes
2answers
42 views
How can we seperate substring by using delimeter in Linux
I have the string below
/a585/app/data/CCN_text/CCN_split_files/ccn.email.list.file07 | /svr00c8/n585 | /a585/app/data/CCN_text | /a585/app/data/CCN_text | /a585/app/data/muttrc | 153.2.254.229 | /...
0
votes
1answer
183 views
Can you pass multiple parameters to a bash function by using bash -c?
I am using the bash -c command and a function:
fun ()
{
echo "$0" ## it reads the parameter $i
}
for i in {1..5}
do
bash -c "fun" $i &
done
My question is can we pass multiple parameters to ...
1
vote
1answer
57 views
How to preview variable substitutions for a command?
u2api --zuser="$USER" --outfmtput=json SQL create_database name=$DATABASE
I would like to easily (e.g. no escaping if possible) print the resulting command instead of executing it.
Is there any ...
-2
votes
2answers
44 views
Preserving quotation marks using bash history
You run a command like echo "hi world".
hi world
Then you run echo !! to try to display the command you just ran.
echo echo "hi world"
echo hi world
The first line outputs the command that will ...
0
votes
1answer
110 views
Bash command after sshpass not executed
Why are commands after sshpass not executed?
Should I somehow signal that the ssh connection has been terminated?
#!/bin/bash
SCRIPT="cd /proj
./run_server &
...
0
votes
1answer
154 views
How to create a Bash script to execute a command until it success for max number of tries
I’m trying to executing a bash script that tries to connect to a VP with a max of 3 retrie. I'm new to bash scripting so maybe there are several error, my code is the following:
current_server=$(...
0
votes
0answers
26 views
How to run script on remote windows machines
I have in my Network some non-domain machines which run Windows Operating System, I need to run some scripts on them remotely, but I don't know how to do that.
If you could recommend anyway to do that....
