Skip to main content
Unix & Linux

Questions tagged [bash-array]

Ask Question

The tag has no summary.

83 questions
Newest Active Bountied Unanswered
Filter by
Sorted by
Tagged with
38 votes
15 answers
51k views

Is there a simple way to reverse an array? #!/bin/bash array=(1 2 3 4 5 6 7) echo "${array[@]}" so I would get: 7 6 5 4 3 2 1 instead of: 1 2 3 4 5 6 7
nath's user avatar
  • 6,104
23 votes
3 answers
11k views

VAR=a,b,c,d # VAR=$(echo $VAR|tr -d '\n') echo "[$VAR]" readarray -td, ARR<<< "$VAR" declare -p ARR Result: [a,b,c,d] declare -a ARR=([0]="a" [1]="b" [2]="c" [3]=$'d\n') How can I tell ...
user1156544's user avatar
  • 359
17 votes
4 answers
18k views

Suppose I have a graphical program named app. Usage example: app -t 'first tab' -t 'second tab' opens two 'tabs' in that program. The question is: how can I execute the command (i.e. app) from within ...
Flux's user avatar
  • 3,318
9 votes
3 answers
26k views

I'm trying to delete range of array element but it's fail.. My array root@ubuntu:~/work# echo ${a[@]} cocacola.com airtel.com pepsi.com Print 0-1 array looks ok root@ubuntu:~/work# echo ${a[@]::2} ...
Rahul Patil's user avatar
  • 25.6k
7 votes
2 answers
10k views

Is there a way to find the length of the array *(files names) in zsh without using a for loop to increment some variable? I naively tried echo ${#*[@]} but it didn't work. (bash syntax are welcome ...
Cristiano's user avatar
  • 73
7 votes
1 answer
365 views

Consider an associative array in bash (versions 5.2.15(1)-release and 5.2.21(1)-release): declare -A ufs=(); ufs["one"]=1; ufs["two"]=2; ufs["three"]=3 printf '> %s\n' ...
Chris Davies's user avatar
  • 128k
7 votes
1 answer
430 views

The following script fails when run with bash 4.4.20(1) #!/bin/bash bar() { local args=("y") } foo() { local -r args=("x") bar } foo with error line 3: args: readonly ...
Dennis's user avatar
  • 73
5 votes
2 answers
15k views

The following post solution works as expected: How to pass an array as function argument? Therefore - from his answer: function copyFiles() { arr=("$@") for i in "${arr[@]}"...
Manuel Jordan's user avatar
  • 2,196
5 votes
1 answer
566 views

I have a piece of code which works, something like this (note this is inside CloudFormation Template for AWS auto deployment): EFS_SERVER_IPS_ARRAY=( $(aws efs describe-mount-targets --file-system-id ...
Carmageddon's user avatar
  • 161
4 votes
2 answers
1k views

In reading through the source to fff to learn more about Bash programming, I saw a timeout option passed to read as an array here: read "${read_flags[@]}" -srn 1 && key "$REPLY&...
qmacro's user avatar
  • 143
4 votes
1 answer
4k views

I don't understand why "${ARRAY[@]}" gets expanded to multiple words, when it's quoted ("...")? Take this example: IFS=":" read -ra ARRAY <<< "foo:bar:baz" for e in "${ARRAY[@]}"; do echo $...
Shuzheng's user avatar
  • 5,009
4 votes
1 answer
2k views

With the following code: #! /bin/bash declare -a arr=("element1" "element2" "element3&...
Manuel Jordan's user avatar
  • 2,196
4 votes
2 answers
2k views

I have an array tokens which contains tokens=( first one two three last ). How do I obtain the values ( one two three ) if I do not know how many numbers are in the array? I want to access everything ...
sriganesh's user avatar
  • 111
3 votes
3 answers
4k views

I need to process some strings containing paths. How do I split such a string by / as delimiter resulting in an unknown number of path-parts and how do I, in the end, extract the resulting path-parts? ...
von spotz's user avatar
  • 515
3 votes
4 answers
3k views

#!/usr/bin/bash ARGENT=("Nous devons économiser de l'argent." "Je dois économiser de l'argent.") BIENETRE=("Comment vas-tu?" "Tout va bien ?") aoarrs=("${...
John Smith's user avatar
  • 827
3 votes
3 answers
8k views

I have an array like this: array=(1 2 7 6) and would like to search for the second largest value, with the output being secondGreatest=6 Is there any way to do this in bash?
user avatar
3 votes
2 answers
754 views

I have an input file, names.txt, with the 1 word per line: apple abble aplle With my bash script I am trying to achieve the following output: apple and apple apple and abble apple and aplle ...
duda13's user avatar
  • 33
3 votes
2 answers
2k views

I want to download and extract a large zip archive (>180 GB) containing multiple small files of a single file format onto an SSD, but I don't have enough storage for both the zip archive and the ...
Kumaresh Balaji Sundararajan's user avatar
  • 51
2 votes
5 answers
4k views

I have 2 arrays to prcoess in bash script simultaneously. First array contains sort of lables. Second array contains values, as under LABELS=(label1 label2 label3 labe4 ) VALUES=(91 18 7 4) What's ...
Sollosa's user avatar
  • 2,009
2 votes
3 answers
495 views

In the file groupAfiles.txt are the lines: file14 file2 file4 file9 I need a way to convert them to remove file and add /dev/loop and put them all in one line with a space between them. /dev/loop14 /...
user447274's user avatar
  • 539
2 votes
1 answer
329 views

I have an array snapshots=(1 2 3 4) When I run printf "${snapshots[*]}\n" It prints as expected 1 2 3 4 But when I run printf "${snapshots[@]}\n" It just prints 1 without a ...
geckels1's user avatar
  • 173
2 votes
1 answer
445 views

This question is similar to this one but it differs from it: Consider this array with string elements which may contain spaces: a@W:$ arr=("eins" "zwei" "eins plus zwei" &...
Adalbert Hanßen's user avatar
  • 303
2 votes
1 answer
114 views

Consider the following example, it seems it's working fine with the index 0: $ a1=(1 2 3) $ a2=(a b c) $ for x in a1 a2; do echo "${!x}"; done 1 a $ for x in a1 a2; do echo "${!x[0]}"; done 1 a ...
NarūnasK's user avatar
  • 2,555
2 votes
1 answer
345 views

I was trying to create a bash "multidimensional" array, I saw the ideas on using associative arrays, but I thought the simplest way to do it would be the following: for i in 0 1 2 do ...
Wellington de Almeida Silva's user avatar
  • 23
2 votes
2 answers
9k views

I have a array: ARRAY=(12.5 6.2) I wish to return the maximum value in ARRAY which Output is 12.5 Anyone can share me ideas? I have try this: max=0 for v in ${ARRAY[@]}; do if (( $v > $max )...
Shi Jie Tio's user avatar
  • 177
2 votes
1 answer
3k views

I have two different arrays with the same length: s=(c d e f g a b c) f=(1 2 3 1 2 3 4 5) how can I mix/merge/combine this two arrays, so I would get this output: c1 d2 e3 f1 g2 a3 b4 c5
nath's user avatar
  • 6,104
2 votes
1 answer
248 views

I am working with a server running Ubuntu 18.01 LTS and I'm trying to automate the backup of multiple virtual machines. I have the VM names in an array and then a for loop to shut down, backup and ...
Jaden's user avatar
  • 51
2 votes
1 answer
75 views

The following code is meant to look for subdirectories in ~/Downloads. I run it with . ./script.sh. It will find them even when the user submits an incomplete name. #!/usr/bin/bash echo -e "\...
John Smith's user avatar
  • 23
2 votes
1 answer
953 views

I'm trying to build a basic REPL in bash. The script dynamically populates a list of files in a directory for the user to run. File space: | |\ scripts/ || script1.sh || script2.sh | \ shell/ | ...
user3116064's user avatar
  • 23
2 votes
0 answers
308 views

I am new to Bash scripting and presently find myself dealing with a small problem in working with for loops, arrays and variable assignment/substitution which I do not know how to solve. Since I am ...
UserAthos's user avatar
  • 21
1 vote
2 answers
3k views

I trying to run command recon-all with GNU parallel freesurfer preproc i have a bash array of list of patients to run 8 patents simultaneously: root@4d8896dfec6c:/tmp# echo ${ids[@]} G001 G002 G003 ...
Relyativist's user avatar
  • 139
1 vote
2 answers
2k views

Perhaps this is a stupid question but two hours on Google hasn't turned up anything on point. Simply, does a difference exist in Bash between: X=" a b c " and X=( a b c ) The former ...
ebsf's user avatar
  • 399
1 vote
2 answers
2k views

I am trying to add an element to a bash array. I looked at this question and tried to follow its advice. This is my code: selected_projects=() for project_num in ${project_numbers[@]}; do ...
chama's user avatar
  • 113
1 vote
1 answer
1k views

Is there a case where mapfile has benefits over arr+=(input)? Simple examples mapfile array name, arr: mkdir {1,2,3} mapfile -t arr < <(ls) declare -p arr output: declare -a arr=([0])="1&...
Nickotine's user avatar
  • 554
1 vote
1 answer
6k views

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 ...
yael's user avatar
  • 14k
1 vote
3 answers
4k views

I have a function (not created by me) that outputs a series of strings inside of quotes: command <args> “Foo” “FooBar” “Foo Bar” “FooBar/Foo Bar” When I try to assign it to an array (Bash; BSD/...
Allan's user avatar
  • 1,100
1 vote
1 answer
346 views

Here is some simple test code. #!bin/bash cpm=(0 1 0.094) lv=1 attack=5 defense=9 stamina=16 echo $((cpm[lv])) mycpm=$((cpm[lv])) #mycpm=`echo "0.094" | bc -l` cq=`echo "$attack*$...
Tim50001's user avatar
  • 73
1 vote
2 answers
193 views

I'm having a bit of difficulty understanding parallel procedures. Atm I'm trying to mass wipe hard drives, so have created a script, however it won't run in parallel. for i in "${!wipe[@]}"; ...
Earthwormben's user avatar
  • 33
1 vote
1 answer
386 views

If we: Define an array; and then.. Define a function; and want to.. Call that array from inside the function.. We can. Like so: Input: myArray=('1' '2' '3' '4' '5') myFunction () { local -n myList=...
voices's user avatar
  • 1,342
1 vote
2 answers
389 views

For example, in the snippet below, (how) is it possible to make array2 identical to array1 while still using a str variable? ~$ { str='a "b c" d'; array1=(a "b c" d); array2=( $str ) echo "${array1[...
glarry's user avatar
  • 974
1 vote
1 answer
1k views

i'm trying to generate a script that ftp some files to a server using lftp. when i run these commands in shell: DBNAME=TESTDB ls -t /data*/${DBNAME,,}Backup/$DBNAME.0.db21.DBPART000.`date +%Y%m%d`...
BlackCrystal's user avatar
  • 796
1 vote
2 answers
2k views

I've got an array that contains duplicate items, e.g. THE_LIST=( "'item1' 'data1 data2'" "'item1' 'data2 data3'" "'item2' 'data4'" ) Based on the above, I want to create an associative array that ...
Bart's user avatar
  • 2,314
1 vote
1 answer
1k views

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, ...
Porcupine's user avatar
  • 2,176
1 vote
1 answer
410 views

I've some associative arrays in a bash script which I need to pass to a function in which I need to access the keys and values as well. declare -A gkp=( \ ["arm64"]="ARM-64-bit" ...
c10's user avatar
  • 13
1 vote
1 answer
970 views

I have a long line that comes as output from a git command: a=$(git submodule foreach git status). It looks like this: a = "Entering 'Dir1/Subdir' On branch master Your branch is up to date with '...
Zaida's user avatar
  • 133
1 vote
2 answers
528 views

I'm trying to learn more bash by updating my bash_profile so that I can quickly do some adb commands that I usually have to copy-paste. I found I was creating many similar functions that all looked ...
Travesty's user avatar
  • 13
1 vote
2 answers
224 views

Can the below code be easily achieved with minimum coding. $ cluster1=(x y) $ cluster2=(a b) $ cluster3=(m) $ my=$((${cluster1[0]+1}+${cluster2[0]+1}+${cluster2[0]+1})) $ echo $my 3 $ my=$((${...
Bharat's user avatar
  • 814
1 vote
0 answers
110 views

I have thousands or more than thousands of files like A20200727.2015+0200-2030+0200_SubNetwork=ppp,MeContext=xxx23,celltracefile_DUL1_3.bin.gz A20200727.2015+0200-2030+0200_SubNetwork=ppp,MeContext=...
Indranil's user avatar
  • 27
1 vote
1 answer
101 views

I'm trying to write a script to tailor my dotfile setup to each machine using git update-index -skip-worktree but it keeps chopping up the paths. I'm passing arrays starting with commands where every ...
Joshua Ferguson's user avatar
  • 305
1 vote
0 answers
301 views

The values present in indexArray are: 1 4 3 2 Below is the code snippet(This is not the complete code): while read -r line;do position=${indexArray[$counter]} # No value is assigned to "position" ...
Deepak Jain's user avatar
  • 11

1
2