Questions tagged [array]
A array is the simplest data-structure for storing items in continuously memory
0
votes
1answer
28 views
bash share array in “for do () & wait” loop
I have an issue with the script below.
It uses a few sql statements in a for loop to set variables and produces a log file. The current db produces +- 1200 lines of output.
The original version is ...
3
votes
2answers
45 views
assign output of command to array
when i run this command:
cat output | grep -i state | sort | uniq | awk '{print $ 3}')
the output is:
00x1
00x5
0080
to aasign them to an array i did this:
STATUS_ARRAY=($(cat output | grep -i state | ...
-2
votes
0answers
23 views
Changing an element in a char array [on hold]
Ok. Simple question. I'm working on a project, in Linux, for a program in C that requires arbitrary information in certain locations. Say I have an array:
char *choices[] = {
"...
18
votes
2answers
805 views
What type of operation is /#/- in “${my_array[@]/#/-}”?
The accepted answer to Transform an array into arguments of a command? uses the following Bash command:
command "${my_array[@]/#/-}" "$1"
I'm trying to figure out what the /#/- part does, exactly. ...
1
vote
2answers
72 views
tar “Cannot stat: No such file of directory” when passing array variables [closed]
I'm trying to write a bash script that will create an archive (tar) of files in a directory. The file extensions need to be passed in as arguments when calling the bash script (./backup.bash pdf txt ...
-1
votes
1answer
93 views
How to put whiptail parameters into an array / loop? [closed]
I have a small but embarrassing / annoying issue with coding whiptail command.
I am passing "$x" parameters to function for whiptail to process. It works as expected , but looks ugly.
I would like ...
4
votes
2answers
196 views
Bash scripting Array concepts
I have two separate lists. One contains 1000 hostnames and other contains 1000 associated IP's for that hosts. I need to generate config entries and push to my config file to add all hosts under our ...
0
votes
0answers
8 views
Python RegEx to Catch White Space Between Array Name and Size [migrated]
I am using a regular expression in a python script to search through a file to find variable declarations. This is what I have so far:
ret1 = re.compile(r'^\s*(volatile|register|typedef)?\s?([\w<&...
0
votes
0answers
37 views
Why can't I mount array disks for dd?
When I have an USB disk recognized, I can do the 'dd' command and wipe data from the stick. I cannot do that with a SCSI disk from array such as NetApp. They don't seem to mount at all. The disk would ...
1
vote
2answers
56 views
to run a command for various variables in shell script
So, i'm storing the values of the first column returned from a sql query in a variable(var)..it's supposed to be an array type, because the sql query returns multiple rows, and later,these values ...
1
vote
1answer
33 views
How to delete existing elements from an array and keep appending new elements afterwards
Below is an example, where I am using two arrays which could be initiated with many elements, for now having "None" as the only element, is there any way to delete existing element/elements and then ...
1
vote
4answers
102 views
How to iterate through an array of numbers in shell-script?
I am trying to iterate through an array created after some command execution.
The code used is:
#!/bin/bash
mailx -H|grep '^ [UN]'>ListOfMessages.txt
msgNumbers=`cut -c 4-5 ListOfMessages.txt`
...
1
vote
1answer
50 views
Bash array using system positions limits? [closed]
Here is my array declaration
arraySYSTEM=( "$@" )
It can have up to 10 "system position(?)" members.
I'm using it to build text parameters passed to whiptail function. Then I select the parameter ...
0
votes
1answer
24 views
Find overlap/intersection of lists with bash
Say I have these two "lists":
#!/usr/bin/env bash
git fetch origin;
first_list=( );
second_list=( );
git branch --merged "remotes/origin/dev" | tr -d ' *' | while read branch; do
first_list+=(...
0
votes
1answer
27 views
command not found assigning value to array in bash
I'm trying to assign a value if the array at a certain index is empty, but I'm getting a command not found error.
while IFS=$';' read -r -a array
do
# if empty set Not Available
if [[ -z ${array[6]} ...
2
votes
2answers
570 views
jq - add objects from file into json array
I want to add an array with elements and value into an existing json file using jq.
I already have a file (input.json) with
{
"id": 9,
"version": 0,
"lastUpdTs": 1532371267968,
"name": "...
3
votes
1answer
128 views
Split zsh array from subshell by linebreak
I would like to instantiate a zsh array from a subshell
myarray=($(somecommand)
and I check if I received what I wanted with
for element in $myarray ; do echo "===" ; echo $element ; echo "---" ; ...
0
votes
2answers
32 views
Bash : Give builded array to function as a list of argument?
I have this issue with borgbackup, but because the reaction is the same, I will use rsync in my example.
I want to build an array of arguments by adding a prefix to each, and then give that array to ...
1
vote
7answers
104 views
Create PHP array from letters
I would like to create a PHP array from the Serbian alphabet.
Out of
а б в г д ђ е ж з и ј к л љ м н њ о п р с т ћ у ф х ц ч џ ш
a b c č ć d dž đ e f g h i j k l lj m n nj o p r s š t u v z ž
...
2
votes
2answers
80 views
Index range of array doesn't allow you to iterate over a new line in bash, please help!
I'm working on a simple bash script that fixes a duplicate naming issue on a retropie.
The script itself grabs any name that is mentioned more than once in a gameslist.xml file, then stores those in ...
0
votes
1answer
95 views
How to set empty array elements set to zero?
I'm writing a script that sends the result of commands to an output array. It involves checking servers for logs and retrieving their sizes, however there are cases in which the server has a failover ...
2
votes
1answer
43 views
Detect optional function argument (array)
Consider this function:
function add_one(in_ar, each) {
for (each in in_ar) {
in_ar[each]++
}
}
I would like to modify it such that if a second array is provided, it would be
used instead ...
0
votes
1answer
54 views
Generate a list of IPv6 into an array
I wrote this script a little while ago :
#!/bin/bash
#Default number of IPs
NUM_IPS=48
if [ "$1" != "" ]; then
NUM_IPS=$1
fi
#Example of IPv6 supplied 2001:41d0:0303:6e1b::/64
read -p "...
2
votes
2answers
61 views
Why doesn't the separator works for array expansion?
I want to limit the change to the separator only to the following echo command not to the shell:
$ myarr=(1 2 3)
$ echo $( IFS="|"; echo "${myarr[@]}" )
1 2 3
$ echo $( ( IFS="|"; echo "${myarr[@]}" )...
5
votes
3answers
2k views
How do I capture a MySQL result set in a bash array?
I'm using bash shell on CentOS 7. I want to run a MySQL query from a shell script and iterate over each row of results. If there were 4 rows returned, I thought I could capture the four rows in an ...
2
votes
2answers
66 views
Zsh, Indirect array variable assignment without using eval
I have a variable VARNAME which contains a name of another variable. I'd like to assign to this another variable without using eval. How can I do that?
Th reason I don't want to use eval is the ...
6
votes
1answer
214 views
Unexpected outcome of a=“$@”
I'm struggling with this situation:
$ set -- 1 2 3
$ a="$@"
$ echo "$a"
1 2 3
What I find unexpected is the assignment itself.
man bash says this about the "$@" expansion:
When the expansion ...
2
votes
5answers
922 views
Number of elements/words in a shell array variable
I have looked at the question How to count number of words from String using shell on SO, which explains how to count words inside a variable.
But this only counts one word inside my variable so I ...
2
votes
1answer
112 views
Why does this code work in bash v4.4 but not bash v3.2?
I have the following bash script:
#!/bin/bash
encl0=( 0,0 0,1 0,2 0,3 0,4 0,5 0,7 0,8 0,9 0,10 0,11 0,12 0,13 0,14 0,15 )
MISSING_DISKS=()
OLDIFS=$IFS
IFS=$'\n'
MISSING_DISKS+=($({ printf '0 %s\n' {...
0
votes
1answer
61 views
bash script to find files thinks the file name should be an integer
I am writing a script to obtain a list of file names from a text file, so that it can find the files and copy them to a specific folder.
When I run the script, I get the following error:
./...
0
votes
1answer
40 views
bash script load an modify array from external file
I have written a script that is reading an array: recentdirs with directory names from an external config file called: defaults.cfg and the user can either chose one of the directories from the list ...
1
vote
2answers
204 views
How to join elements of an array in POSIX delimited by a space?
The following works in a Bash script:
PACKAGES=(
'curl'
'git'
'htop'
'mc'
'tree'
'vim'
)
apt --yes install ${PACKAGES[@]}
But how can I do the same in POSIX so that I can ...
1
vote
1answer
93 views
Compact way to get tab-separated fields into variables
In Bash, I'm reading out fields from a line into an array. Let me stress that performance is an issue, so I can't afford anything that spawns subprocesses.
To make the code more readable, I want the ...
0
votes
2answers
63 views
What exactly is the Length of an Array in bash and how to differ '*' and '@'?
I have the following example script and want to know what exactly is the length of an array, are this bytes, characters or what else?
#!/bin/bash
# Arrays
# @ vs. *
ape=( "Apple Banana" "Emacs ...
0
votes
1answer
333 views
Concatenating a list of files using For loop
I'm new to unix/bash/code in general, and I'm trying to merge multiple sample files with the same name in different directories into a new file in its own directory (the outputs of multiple data ...
3
votes
1answer
190 views
How to create a possibly empty array from filename glob?
With zsh, it is not difficult to create a possibly empty array from the results of a (possibly null) filename glob. For example:
% pathlist=( /no/such/path/*(N) ); printf -- "%d\n" $#pathlist
0
...
1
vote
1answer
277 views
How to add values to an array which contains a variable in the array name in bash?
I have an array in my script that takes a list of group names. This list does not have a fixed number of elements.
GROUPS=(group1 group2 group3)
Each element in this set of GROUPS can have an ...
3
votes
1answer
183 views
Is 'array=X' always assigned to first element in bash?
Is 'array=X' always assigned to first element in bash?
If that is not,maybe I need some "for example" to understand following text from man bash page:
When assigning to indexed arrays, if the ...
0
votes
1answer
49 views
Set two or more files for execution (via source) in a comfortable way to read
I used the following way to execute a collection of Bash script files, in the current Bash session:
source ~/myScripts/{assignments.sh,nginx_conf.sh,php_conf.sh,drush_install.sh}
It feels to me ...
4
votes
2answers
801 views
How to use pseudo-arrays in POSIX shell script?
I can't get my head on:
How to use pseudo-arrays in POSIX shell script?
I want to replace an array of 10 integers in a Bash script with something similar into POSIX shell script.
I managed to come ...
0
votes
2answers
3k views
Ansible array variable
I have a template file config.j2.
{% for host in groups['dbs'] %}
ips= {{ hostvars[host].ansible_default_ipv4.address }}
{% endfor %}
My output is:
ips= 192.168.231.91
ips= 192.168.231.92
...
0
votes
1answer
13 views
RHSA installation in RH7
this is a question similar to the mine I asked you yesterday (how to iterate installation in a row).
I need a script that starting from an RHSA list as argument, separated by " " spaces, it performs ...
3
votes
1answer
262 views
Bash: space as a key in an associative array
This code in Bash
s="There are seven pencil"
declare -A A
while IFS= read -rn1 a; do
[ -z "$a" ] || [ -n "${A[$a]}" ] && continue
printf %s "$a"
((A[$a]++)) # A[$a]=x
done <<<"$...
-1
votes
1answer
113 views
Sum of the array is not printing
I am trying to create a script where the sum of the array is what prints but my results just end up showing me "Sum: 0"
Here is my script so far.
Any help in correcting this would be appreciated.
#!...
3
votes
1answer
74 views
Disadvantages of assigning an array to a variable like this: array2=(“${array1[@]}”)
I can copy an array to another like this:
array2=("${array1[@]}")
One of the disadvantages of this approach is that the indices will not be preserved. For example: if array1 have three elements with ...
0
votes
2answers
26 views
Invalid package name due to Bash array dereference [duplicate]
I'm trying to build Emacs from sources. When configure options were listed without an array Emacs configured properly. When I added a Bash array to add optional options it broke configure. Here is the ...
0
votes
1answer
839 views
linux + how to convert variable to array
we want to set variable that includes words as array
folder_mount_point_list="sdb sdc sdd sde sdf sdg"
ARRAY=( $folder_mount_point_list )
but when we want to print the first array value we get all ...
5
votes
4answers
2k views
how to shift array value in bash
we want to build 6 mount point folders as example
/data/sdb
/data/sdc
/data/sdd
/data/sde
/data/sdf
/data/sdg
so we wrote this simple bash script using array
folder_mount_point_list="sdb sdc sdd ...
1
vote
0answers
35 views
bash + how to set variable instead array element [duplicate]
we can build array list of a..z range as the following
example1
list=({a..z})
echo $list
echo ${list[*]}
a b c d e f g h i j k l m n o p q r s t u v w x y z
but in case we want to set variable in ...
1
vote
1answer
69 views
Better way to retrieve n-th (index) positional parameter value in `ash` then `eval echo \$$n`?
I'd wish the user to select a file from a numbered list on screen in a mkinitcpio busybox ash environment. The list needs to be filled/sorted from top to bottom and printed in columns, like:
1) 2017-...
