Questions tagged [array]
A array is the simplest data-structure for storing items in continuously memory
0
votes
1answer
19 views
Different result for positional parameters expansion and custom array expansion
There is a difference in the output of commands that I don't understand, as stated below:
INPUT="$@"
echo "$INPUT ${#INPUT} ${#INPUT[@]} ${#@}"
# outputs: a b c 5 1 3
arr=(a b c)
echo "$arr ${#arr} $...
0
votes
2answers
32 views
bash: convert array into string preserving white spaces
I am just trying to convert an array into string, while preserving the white spaces. This is what I have:
INPUT=$1
readarray -t arr < <(grep -o . <<< "$INPUT")
echo "${arr[*]}"
I ...
0
votes
1answer
18 views
fold: outputs only the first character
I am using fold to make an array of characters from a string.
INPUT=$1
arr=($(fold -w1 <<< "$INPUT"))
echo "$arr"
echo "$arr[@]"
I use command ./myProgram 1234 to execute the script.
...
3
votes
2answers
105 views
How to store (and load) a zsh String array to a file?
I want to store an array of some quotes (so basically real-world strings with new lines) in a file. How can I achieve it? I thought of setting the IFS to something like “xxxxxxxxx74765xxx” (which will ...
1
vote
3answers
52 views
bash array with space in element [on hold]
I have a text log file
$ cat aaa
673 20160405 root "/path_to/gis/20160401/20160301_placement_map_org.dbf" ""
673 20160405 root "/path_to/gis/20160401/...
0
votes
1answer
30 views
grep for multiple elements of an array
I am trying to write a dd migration script that will do the following:
read user input (max=4) into an array, called "array". the user will enter the logical volume names to be migrated.
once each ...
1
vote
2answers
62 views
grep using array values and make it faster
array[1] is a string pulled from a 30k lines CSV:
example:
samsung black 2014
I need match those lines with one of the values contained within an array (arrayItems).
arrayItems contains 221 values ...
0
votes
1answer
50 views
Check that 2 arrays of file names are the same
So I have the following:
cat file | grep -E regex
which gives a list of lines
Now I also have a for loop the produces a list of files
So it is like I have 2 arrays.
But how do I check in bash if ...
0
votes
1answer
29 views
Sed search and delete matching two patterns one of which is a variable
I have a file that contains multiple instances of code that I need to delete. Here is an example:
!/bin/bash
mkdir /rootdir/pipeline_runs/oncology/analysis/sample_1_NA172_1
cd /rootdir/pipeline_runs/...
0
votes
0answers
22 views
Print all awk array elements [duplicate]
I want to print all the elements of a split string using awk (I have my reasons to use awk).
Here's the gist of what I'm doing:
thething="; "
echo "What's the filename?"
read filename
echo " "
...
0
votes
1answer
17 views
Array inside an Array: Different syntax for Array in bash
I found the following example from here. But I can't understand how is array arr is being defined.
a='domain.de;de;https'
$ arr=(${a//;/ })
What is the advantage of defining it like this?
Actually, ...
-2
votes
1answer
24 views
Is a delimiter included in the field in front of it?
If I am correct, in bash, readarray uses some delimiter to separate the input into fields, and the delimiter defaults to a newline.
Unlike a separator, a delimiter is included in the field in ...
-2
votes
2answers
68 views
Why does double quoting an array expansion in here document not seem to work here?
I have two arrays
$ arr1=( 1 2 2 3)
$ arr2=( 2 3 3 4)
Why does this generate strange output when I follow the good practice of double quoting an array expansion
$ tsort << EOF
> "${arr1[@]}...
9
votes
6answers
704 views
Bash sort array according to length of elements?
Given an array of strings, I would like to sort the array according to the length of each element.
For example...
array=(
"tiny string"
"the longest string in the list"
"middle ...
0
votes
3answers
50 views
Duplicate elements of an array except the first and last elements
I have an array, and I would like to repeat each element except the first and last elements.
For example if the array has five elements 1 2 3 4 5, then after repeating, its elements should be 1 2 2 3 ...
1
vote
1answer
94 views
Does readarray allow to specify line delimiter?
In bash read builtin has -d for us to specify line delimiter other than newline
Does readarray provide some way to specify line delimiter?
Is it correct that it has no an option for that purpose?
...
-2
votes
0answers
26 views
Where are the embedded newlines in the file are gone in the output of the following command? [duplicate]
I have a file:
$ cat ffll
abc
123
er3
I was wondering where the embedded newlines in the file are gone in the output of the following command,
$ arr=( "$(cat ffll)" )
$ echo ${arr[1]}
$ echo ${arr[...
0
votes
4answers
38 views
Array + why arrays are not in the Right place
I set an array named “disks” to the following words - sdb sdc sdd
in bash shell:
declare -A disks
Machine=worker01
disks[$Machine]="sdb sdc sdd"
now we print all words as the following:
echo ${...
0
votes
1answer
34 views
Bash - How to put an array inside values of variable?
I have a web.txt file which contains:
youtube
facebook
google
My sh file contains:
readarray web < web.txt
url = www.website.com
Commands I have used:
readarray web < web.txt
url = www."$...
0
votes
0answers
34 views
Problem with using gawk multi-dimension array in cygwin
Background: I'm trying to create a program that reads multiple files and creates a hist from the data in all of them. The data has 3 features, so I am building up a multi-dimensional array.
the code ...
1
vote
2answers
56 views
How can I provide an array as a file argument to a script, so that each element is like a line in a file?
Suppose a bash script expects an argument to be a file. But we have a bash array, and would like to provide the array in some way as an argument to the script, as if there were a file whose lines are ...
1
vote
2answers
164 views
How to Use an array of strings in bash
I writte the following script
load function should set the array disk[a]=1 and disk[b]=2 and so on
Then the function out should print the array ${disk[a]} , and ${disk[b]} , and so on
But what we ...
0
votes
0answers
14 views
Trouble with Array Appending [duplicate]
I'm iterating through a grep of my hosts file and am trying to separate the hostname and IP address into separate arrays.
Now I tested my syntax:
a=0
host=(a b c d)
addr=(1 2 3 4)
addr+=(1)
echo ${...
0
votes
1answer
29 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
61 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 assign them to an array, I did this:
STATUS_ARRAY=($(cat output | ...
17
votes
2answers
814 views
What type of operation is /#/- in “${my_array[@]/#/-}”?
The accepted answer to Transform an array into arguments of a command? uses the following Bash command:
command "${my_array[@]/#/-}" "$1"
I'm trying to figure out what the /#/- part does, exactly. ...
1
vote
2answers
203 views
tar “Cannot stat: No such file of directory” when passing array variables [closed]
I'm trying to write a bash script that will create an archive (tar) of files in a directory. The file extensions need to be passed in as arguments when calling the bash script (./backup.bash pdf txt ...
-1
votes
1answer
113 views
How to put whiptail parameters into an array / loop? [closed]
I have a small but embarrassing / annoying issue with coding whiptail command.
I am passing "$x" parameters to function for whiptail to process. It works as expected , but looks ugly.
I would like ...
3
votes
2answers
208 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
38 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
57 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
213 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
53 views
Bash array using system positions limits? [closed]
Here is my array declaration
arraySYSTEM=( "$@" )
It can have up to 10 "system position(?)" members.
I'm using it to build text parameters passed to whiptail function. Then I select the parameter ...
0
votes
1answer
31 views
Find overlap/intersection of lists with bash
Say I have these two "lists":
#!/usr/bin/env bash
git fetch origin;
first_list=( );
second_list=( );
git branch --merged "remotes/origin/dev" | tr -d ' *' | while read branch; do
first_list+=(...
0
votes
1answer
48 views
command not found assigning value to array in bash
I'm trying to assign a value if the array at a certain index is empty, but I'm getting a command not found error.
while IFS=$';' read -r -a array
do
# if empty set Not Available
if [[ -z ${array[6]} ...
2
votes
2answers
1k views
jq - add objects from file into json array
I want to add an array with elements and value into an existing json file using jq.
I already have a file (input.json) with
{
"id": 9,
"version": 0,
"lastUpdTs": 1532371267968,
"name": "...
3
votes
1answer
180 views
Split zsh array from subshell by linebreak
I would like to instantiate a zsh array from a subshell
myarray=($(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
123 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
94 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
147 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
62 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
56 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
65 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
3k 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
72 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
221 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
1k 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
117 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' {...
