Questions tagged [parameter]
The parameter tag has no usage guidance.
185
questions
3
votes
1answer
25 views
Indirect parameter expansion in associative array
Following this answer, I want to apply the approach on my script. The basics of it is:
foo="bar"
baz="foo"
echo "${!baz}"
bar
I want to provide translated strings, like ...
0
votes
1answer
18 views
Remove the first parameter in $*
I've got a small "logit" script;
#!/bin/bash
echo "• $(date +%Y.%m.%d.%H.%M.%S) • " >> "$1"
printf "%s" "$*" >> "$1"
This way I ...
6
votes
3answers
307 views
Most robust way to list every basename in a directory, sorted by modification date?
Given a directory containing:
note 1.txt, last modified yesterday
note 2.txt, last modified the day before yesterday
note 3.txt, last modified today
What is the best way to fetch the array note 3 ...
0
votes
3answers
43 views
Find xml tag and replace the text inside the tag to a parameter value multiple occurrences
Find a specific xml tag and replace the text inside tags to some parameterized value. Multiple occurrences need to be replaced.
Sample file content:
<a>abc</a>
Current attempt:
sed -i &...
0
votes
2answers
80 views
how can i detect user input is coming from pipe line or with parameters? (as using “if else”)
how can i detect user input is coming from pipe line or with parameters? (as using "if else")
example:
with pipeline
$ cat input_file | ./example.sh
hello
world
with parameters
$ ./example.sh "...
0
votes
1answer
22 views
How do I delete the lines in a range that contain a given string from a script?
I believe the title is self-explanatory.
I have some files given as parameters and the given string is the last parameter of my script.
I have tried the two scripts below and do not know how I could ...
0
votes
1answer
50 views
Passing custom parameter from GRUB to the OS
My program, wich is bash scripts, runs in a custom ISO with Debian.
I want a GRUB menuentry that passes a parameter from GRUB to the OS, a debugging flag, so I can test the program, and at the same ...
0
votes
1answer
30 views
Processing parameters with * passed to unix [duplicate]
I am receiving a query via a configuration file in unix, for ex. Config file content will be in the format:
Table_name|query
ABC|select ABC.A,ABC.B from PQR left join (select * from ABC) on ABC.pk=...
1
vote
1answer
439 views
How does the tftpd-hpa --verbosity option work?
I'm trying to set up a TFTP server using tftp-hpa, and according to the manpage I can use the --verbosity option to get more output.
Unfortunately I can't find anything that explains what I should ...
0
votes
0answers
45 views
Shell scripting parameters
I have the following script. I want the inputs to be: -a, -l, -s <number>, -c <keyword>, -d <keyword> -b/-r, -n. However, there's a problem with the number and keyword parameter as ...
0
votes
1answer
154 views
Apply multitail's filtering to many files passed via wildcard
multitail has a nice regex-based filtering mechanism that is described in the manpage and online manual. Both sources state that log lines matching a given regex can be excluded from output using the -...
5
votes
2answers
226 views
Customize sysctl parameters by user
I know there's *.conf file in /usr/lib/sysctl.d and/or /etc/sysctl.d folders ready to establish kernel parameters on boot. But they are general;
what I want is to customize some of these parameters (...
0
votes
0answers
35 views
How is it possible to call CwRsync.exe via a Bash Script with variables and arguments?
This is the commandline currently used to call Rsync that's part of Cygwin 64 install.
rsync -aqHPR $CygSrcRoot/./$FolA1 $CygSrcRoot/./iMazing.Versions/Versions/$FolA1 $CygDstRoot/$DstCountFol --...
0
votes
1answer
422 views
Why arguments which passed to .sh file are missing after sudo su?
I need to run .sh file on my server from my local machine.
I could do it using below command.
ssh -p my_port_no -i path_to_key user@ip_address "bash -s" < testOnServer.sh
Now I need to pass some ...
1
vote
1answer
34 views
Parsing an array as one of many keyword parameter in a bash script
I have a bash script (script.sh) that takes in many parameters in the format --keyword value. It is read in when the script is invoked with the following lines:
# Get our arguments using flags,
while ...
2
votes
1answer
134 views
What is the historical reason for using curly braces {} as placeholder in find -exec
Everyone knows find . -exec foo {} \; and at some point stopped thinking about it. But recently I came back to the question that arose when I first learned it:
Why would anyone choose {} as the ...
0
votes
2answers
1k views
Check mandatory argument of parameters
I have script with several parameters that have required argument:
while [ "$1" != "" ]; do
case $1 in
-f | --first ) shift
first=$1
...
3
votes
1answer
137 views
How to deal with optional input in shell script?
My assignment task is to print n longest lines from text files. The output is n longest lines with line number and in the same order as in the original file. For example, in the original file:
...
0
votes
1answer
55 views
Start new shell with positional parameters
With Python, I can start a session with positional parameters:
$ python3 - aa
>>> import sys
>>> sys.argv[1]
'aa'
However it does not seem to be possible with shell:
$ sh - aa
sh: ...
0
votes
1answer
175 views
Variable rsync filter parameters
I have an issue with a variable rsync parameter.
I concat filtered expression on COMPILE_FILTERS variable.
Example :
COMPILE_FILTERS='--filter="- js/editor/editorjs/*"'
rsync -a $COMPILE_FILTERS \
-...
0
votes
1answer
65 views
How does zsh expand variables before passing to programs?
A basic rule of zsh is that you don't need to quote your variables, for example:
% data="single argument"
% print -l $data
single argument
One exception I know of is that if an argument must not be ...
0
votes
1answer
67 views
Translate a single line into a file with one shell command
I'm looking for a convenient command to run from my terminal. At now I'm using
$> FILE=./file_for_translate.md && ROW=84 && \
DATA=$(sed -n ''"$ROW"'p' $FILE | trans -no-init -no-...
0
votes
1answer
747 views
How to execute a script on several nodes using Slurm?
I have a R code that I want to execute on several nodes using Slurm, with each iteration of my paramater which goes on a node. This is my Slurm code :
#!/bin/bash
#SBATCH -o job-%A_task.out
#SBATCH -...
2
votes
2answers
210 views
How do I delete files except some specific files passed as parameters?
The task is to write a shell script with n+1 arguments where the first one is the directory and the rest is the specified files and will delete all but specified files.
E.g. calling rmexcept . '*....
0
votes
1answer
132 views
How to print / echo positional parameters index
I have this working and simple code to echo positional parameters VALUES
for i
do
echo "Argument = $i "
done
Here is the actual output from the scrip
Argument = --atleast-pkgconfig-version
Argument ...
8
votes
5answers
2k views
Using parameter substitution on a Bash array
I have file.txt that I need to read into a Bash array. Then I need to remove spaces, double quotes and all but the first comma in every entry. Here's how far I've gotten:
$ cat file.txt
10,this
2 0 ...
9
votes
1answer
2k views
Pass associative array as parameter list to script
In a script I have an associative array like:
declare -A VARS=( ["key1"]="value1" ["key2"]="value" )
Is there a single command to transform that into a parameter list in the form
--key1=value1 --...
-1
votes
1answer
92 views
Shell Function: Sequence of Pipelines as Argument
I have a shell function (in .bashrc) which creates a temp file, executes the arguments (including all sequence of pipelines), redirects it to a temp file and then open it in VS Code.
I invoke the ...
1
vote
1answer
1k views
Bash: Error in assigning default value to a variable
Inside my bash script:
This works:
CWD="${1:-${PWD}}"
But, if I replace it with:
CWD="${1:=${PWD}}"
I get the following error
line #: $1: cannot assign in this way
Why I can't assign to ${1}?
0
votes
2answers
759 views
how to pass argument to shell and check if argument is not empty
i have this little piece of code lets say get.sh that sets the date into a variable like this
date=$(date +%b%d%y)
now I want to be able to pass custom date parameter to get.sh like
./get.sh --...
2
votes
1answer
136 views
How may I echo all but the last parameter in bash?
I have the following
#!/bin/bash
function f1 ()
{
echo "${@:1:-2}"
}
f1 1 2 3 4 5 6
I need to echo 1 2 3 4 5
man bash tells me that when I use @ I can't use a negative length.
I resorted to using ...
4
votes
1answer
1k views
How to distinguish between a positional parameter and an option?
Both a positional parameter ($1, $2, and so forth) and an option (and/or argument) are written directly after a command, so what is the definition or phrasing to explain how to distinct them?
In ...
0
votes
1answer
845 views
sh shell: how to use $1 inside quotes
I am using this code:
#!/bin/sh
if [ $# -lt 2 ]
then
echo "wrong syntax"
echo "ct_cmp.sh <label1> <label2> [<file_extension>]"
else
if [ $# -eq 2 ]
then
...
1
vote
2answers
605 views
Removing digits from beginning of filename [duplicate]
I was hoping this would work:
$ find . -type f -exec basename {} \; | while EFS= read -r f; do echo "${f##[0-9]}"; done
But, for example, for files named as:
1foo
11bar
it returns:
foo
...
0
votes
1answer
793 views
How to use parameter expansion with find -exec {}? [duplicate]
I want to incorporate something like:
for f in */*; do mv "$f" "${f%/*}/foo.${f##*.}"; done
Into my find x -exec y {} \;-style workflow.
The for loop construct & "$f" variable will ...
1
vote
3answers
119 views
Is there a way to protect a file in any way so that other superusers CANNOT modify, delete or overwrite it?
When entering a sudo command file is there a way to set a parameter(s) which locks the file afterward so it cannot be modified, deleted, or overwritten by any other superusers?
More specifically: I ...
0
votes
1answer
33 views
Pass parameter to a different bash shell
I have written a bash script
Script1.sh
#!/bin/sh
read -p "Enter name of the document file :" name
read -p "Enter LHOST :" lhost
read -p "Enter LPORT :" lport
echo "use exploit/...
1
vote
2answers
4k views
Handling unused getopts argument (are options not mandatory?)
I have a script that starts with getopts and looks as follows:
USAGE() { echo -e "Usage: bash $0 [-w <in-dir>] [-o <out-dir>] [-c <template1>] [-t <template2>] \n" 1>&2;...
0
votes
2answers
46 views
How to pass in log file creation to pass in to script to attach the file
I have several cron jobs I run to back up dbs:
0 8 * * * BACKUP=DEV DB=01 /usr/local/bin/backup.sh > /var/log/backup-db01-`date "+\%m\%d\%y"`.log 2>&1||/usr/local/bin/create-ticket.sh
0 16 ...
1
vote
1answer
860 views
How does FIO benchmark set IOdepth?
NOTE: My question stems from this other U&L Q - What exactly is iodepth in fio?
I want to know how internally FIO sets I/O depth. I.e., one of the parameters we submit to FIO when we run it is "...
0
votes
1answer
141 views
Create custom parameters (options) for already existing commands?
Recently I 've been wanting to create a custom parameter for pacman.
To elaborate, I have tweaked pacman.conf so that specific packages (linux, linux-firmware, and a couple more) are ignored when I ...
5
votes
3answers
1k views
Parameters passed to a sourced script are wrong
A script on AIX which checks the number of parameters passed and complains if they are not correct:-
if [ "$#" -ge 1 ]; then
...
else
echo 'Usage: myscript <a> [b] [c]'
fi
The script sets ...
3
votes
2answers
183 views
How to pass a search pattern starting with $ to less on the command line
I just tried to pass a search pattern starting with $ to less:
less +/'\$l' myfile.pl
and I got
There is no -l option ("less --help" for help)
After reading the manual, I tried the alternate -p-...
0
votes
1answer
346 views
How to pass variable values to a script and run it in one line?
I have a file (temp_4n.in) with the following lines:
5 C 172.0696
5 C 135.6942
5 H 30.9062
5 H 31.8124
12 H 31.0377
12 O 293.0612
12 H 32.4678
I have a script (...
1
vote
2answers
263 views
parameter operation inside awk line
When I run bjobs -w in the machine where I work, I get the next output:
JOBID USER STAT QUEUE FROM_HOST EXEC_HOST JOB_NAME SUBMIT_TIME
821213 user1 RUN parallel16 hpc2 16*...
4
votes
1answer
1k views
Is bash special parameter $@ treated as a loop in printf?
So I am testing the following:
foo() {
printf "\nAll the parameters, each on a separate line:\n"
printf "param: %s\n" "$@"
}
foo The "nicely colored" rainbow
The output is:
All the ...
1
vote
1answer
44 views
Why does substring expansion [ test=“-efoo”; echo ${test:0:2} ] fail?
On Linux Mint, using bash..
test="-ffoo"; echo ${test:0:2}
works outputting the first two characters
but
test="-efoo"; echo ${test:0:2}
fails, with apparently null output.
I'm thinking the form ...
2
votes
3answers
1k views
Use of positional parameters inside function defintion
How do I use the positional parameters (which are given from the command line) inside of a function declaration?
When inside the function definition, $1 and $2 are the only the positional parameters ...
0
votes
1answer
2k views
Syntax error near unexpected token `}' in a Bash function with an if-then statement [closed]
I stored the following script in a file and created an alias to that file in the user's bashrc, then sourced that bashrc:
#!/bin/bash
domain="$1" && test -z "$domain" && exit 2
...
0
votes
2answers
115 views
How to use param values inside for loop
I am running my script as script.sh 12345 12346 12347
for z in 1..$(seq 1 $#);
do
echo "param $z is $($(echo $z))"; //Line 4
done;
I am expecting output as below:
param 1 is 12345
param 2 is ...
