Questions tagged [array]
A array is the simplest data-structure for storing items in continuously memory
589
questions
8
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2
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In bash, how do I get the index of the last element of an array without a loop
In bash, is it possible to get the index of the last element of an array (that might be sparse) without looping through the entire array like so:
a=( e0 e1 ... )
i=0
while [ "$i" -lt $(( ${#...
- 367
3
votes
1
answer
108
views
Cut or Awk to save lines on array in bash
I have a scenario that I have to put lines of a file .txt inside an array, example of file content;
type of host
|
| first host
| |
| | second host
| | |
| | | same ip ...
- 31
1
vote
1
answer
40
views
Ansible convert dictionary to mix of dictionary/array
I use following files:
variable file: db.yml
x86_64:
alpine:
version: 3.15.0
debian:
version: 11.3.0
aarch64:
alpine:
version: 3.15.0
debian:
version: 11.3.0
playbook: ...
- 61
0
votes
1
answer
35
views
convert a uint8 array ( javascript new Uint8Array() ) to binary format (or binary mode ?) in shell / bash?
The question is about convert from new Uint8Array() generated from javascript into a normal file (file that can be used with other programs like ffmpeg)
** I don't know the right term to use if it's ...
- 115
0
votes
1
answer
82
views
Counting file extensions in a string array
I have a $FILES array which consists of strings of 4 filenames:
FILES=$(ls /my/directory | shuf -n 4)
The contents of the array look something like: file1.jpg file2.jpg file3.gif file4.mp4
I want to ...
- 11
2
votes
5
answers
254
views
match value2 in 2 files if value 1 is exact match
I have 2 files containing list. Column 1 is userIds & column 2 is associated values
# cat file1
e3001 75
n5244 30
w1453 500
#cat file2
d1128 30
w1453 515
n5244 30
e3001 55
Things to consider.
...
- 1,613
5
votes
2
answers
403
views
how to test if index exists in array
I'm writing a Git Bash utility that copies a project folder from one location to another. There are multiple destinations to which the user may want to copy the project, though only one location per ...
- 157
3
votes
1
answer
125
views
Trying to put output of grep command into a bash array
If I run the following grep command I get the output I am expecting:
$ grep -o -E '/ |:|\\|<|>|\*|\?|\"| $' <<< '/home/ttwaro/temp/Test/This is a Test: Testing Number 1?/This is ...
- 31
0
votes
2
answers
62
views
awk matching fields in 2 separate files using command containing {BEGIN FS = "|"} returns output of blank lines
Two files: data1
Name |formula |no. |dose|days|cost |msg|em|notes
Fname-Lname|BXXXT+GG |8262|4 |14 |57.78 | | |sq
Fname-Lname|SJXXT+GG |8263|4¾ |...
- 25
1
vote
0
answers
121
views
Create a tsv file with data from several files
How can I create a tsv file from multiple files?
I want to be able to create a tsv file from several different files. One sample is associated with five 'region' files that have data in them. For ...
- 23
0
votes
1
answer
103
views
Getting the first/last/nth result from a jq select result
I am trying to find a way to pipe the result of my current script into another command which will leave me with just the last result of the array I get in my select here:
jq -r --arg name "$1&...
- 1
-1
votes
1
answer
40
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write bash code loop a file line by line that have values, first word as a row and create csv [closed]
i have this sample data
dn; uid=456456456,cn=users,dc=efsfb,dc=org,dc=co;
objectclass; top;
objectclass; person;
objectclass; organizationalPerson;
objectclass; inetOrgPerson;
uid; 456456456;
...
- 101
-3
votes
1
answer
43
views
Difference between two array printing methods in bash [duplicate]
I have an array declared in my script.
NAME[0]=Deepak
NAME[1]=Renuka
NAME[2]=Joe
NAME[3]=Alex
NAME[4]=Amir
echo "All Index: ${NAME[*]}"
echo "All Index: ${NAME[@]}"
There are two ...
- 5
3
votes
1
answer
70
views
passing tab separated entries to readarray
Obviously I'm not doing it right, but I think the intended outcome is clear (${#arr[@]}=3)
$ readarray -d "\t" arr < <(printf "%s\t%s\t%s" "x" "y" "z&...
- 481
1
vote
2
answers
330
views
How to pass an array as function argument but with other extra parameters?
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[@]}"...
- 882
0
votes
1
answer
23
views
bash :: use imported array
myVAR='myArr'
. ./myArraysFile # external file with all my arrays, one of the arrays is myArr=('one' 'two' 'three')
I need to use this arrey with further scripting
Examples:
echo ${!myVAR}[1] # I ...
- 3
0
votes
1
answer
113
views
What is the difference between ${array[*]} and ${array[@]}? When use each one over the other? [duplicate]
With the following code:
#! /bin/bash
declare -a arr=("element1"
"element2" "element3&...
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1
vote
1
answer
47
views
AWK: Add missing lines in csv file and set specific column to "0"
(Note: this question is heavily shortened because the detailed question was blocked with "This looks like spam.")
I'm having a hard time adding missing lines to a series of data in a ...
- 13
3
votes
3
answers
114
views
Store expanded array in a variable using a brace expansion
I want to store node1 node2 node3 in a variable so that it may be used as an input to other scripts.
However, I want to do so by using brace expansion given by bash like so: node{1..3}
I tried to have ...
- 29
0
votes
0
answers
21
views
Bash array append - removes existing elements [duplicate]
I tried:
$ a=("-f" "apple" "c")
$ a+=("-e" "banana" "d")
$ echo "${a[@]}"
-f apple c -e banana d
$ a=("-e" "apple&...
- 1,362
0
votes
3
answers
56
views
Two arrays in nested for loop over ssh lead to unwanted connection-user permutations
I am trying to update some files on 3 nodes, where I want to combine every connection with a specific user path. As I am very new to this, I extended a for loop I used to connect as root, into a ...
7
votes
1
answer
292
views
Unary test -v on an array element
In bash, the conditional expression with the unary test -v myvariable tests wether the variable myvariable has been set. Note that myvariable should not be expanded by prefixing it with a dollar, so ...
- 277
0
votes
3
answers
216
views
How do I return an element from a bash array using a partial string match?
I have a bash array containing several elements, only one of which will be in the format nn.wr , where nn is a variable integer.
eg
array=( "abcd" "01.wr" "ef_gh" )
...
0
votes
2
answers
76
views
For-loop - appending to arrays with iterator in the array name
I have the following problem. I have an array arr with some values. I want to sort each value into a set of different - and already declared - arrays earr$j, i.e. arr[0] into earr1, arr[1] into earr2 ...
- 21
2
votes
0
answers
66
views
for loop and appending over list of arrays
I am new to Bash scripting and presently find myself dealing with a small problem in working with for loops, arrays and variable assignment/substitution which I do not know how to solve. Since I am ...
- 21
2
votes
1
answer
91
views
zsh pipestatus disappears in the following prompt
I am on zsh 5.8 (arm-apple-darwin20.2.0). Unlike the way PIPESTATUS in bash is available to read during the next shell prompt, pipestatus of pipe in zsh seems to disappear in the following prompt.
❯ ...
- 158
0
votes
1
answer
77
views
Find and manipulate array element in KSH
I have an array that reads like this:
# echo "${ARRAY[@]}"
1=Napp Slice
4=NNN Issue
3=GG Allow
2=CO-OP
1=Quit
And I want to loop through it to see if any contain the word Quit and if so, ...
2
votes
1
answer
24
views
Loop through file with unique identifer and compute cumulative sum
I have a large text file, as shown below, where column1-colum3 define a region and fourth column is unique identifier. The column 6 is assigned value of the region.
chr6 26204834 26204839 ...
- 105
0
votes
3
answers
58
views
How i should change this to use array?
i just writing a script for make a Symbolic Links, but i think i have too much line can be much less with array, but i don't find an example with an explaniation for put multiples path in array.
The ...
- 29
0
votes
0
answers
14
views
How to extract only not qualified files based on fileformats in array
I have trouble with the code below.
The first part of the IF-statement works fine. All valid files that has file formats listed in the array arr are printed on the screen.
However the ELSE-statement ...
- 111
1
vote
0
answers
29
views
Is it possible to mount an ATA over Ethernet (AOE) block device on multiple clients, if so how?
I have a lab consisting of 3 machines connected with 2 10gbe links on 2 segregated networks. Each device has 100tb in block storage connected to it. I want to use ATA over Ethernet to create a storage ...
- 111
0
votes
1
answer
58
views
Access element of array
I have the following script which retrieves info from mysql
#!/bin/bash
set -f
IFS=$'\n'
arr=($(sudo mysql -u root -h localhost -e "USE mydb;SELECT * FROM users"))
for i in "${...
- 3
8
votes
2
answers
3k
views
how to jq nested array without key (only value) and convert to csv
I hope someone can guide me how do I convert below json to csv that I'm expecting for.
Much appreciated in advance.
Update: thanks for the solutions provided, but I found that sometimes array does not ...
- 99
0
votes
1
answer
294
views
Why is echo needed for IFS to take effect in zsh?
I am trying to read members of the PATH into an array using zsh 5.8. I am used to Bash, where the following normally works:
IFS=: p=($PATH)
However with zsh, this actually gives me an array with only ...
- 1,843
1
vote
1
answer
390
views
Bash - mix/merge/combine two different arrays with same length
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
- 4,740
1
vote
1
answer
555
views
Putting string with newline separated words into array
I currently have a a bash variable that holds a string similar to this one,
where each different phrase is separated by a newline:
var="1st word
2nd word
4th word"
Note there is an empty ...
- 77
1
vote
2
answers
312
views
Finding duplicates and their indices in an array in Bash
I want to find the duplicates in an array and their indices using bash.
For example, I have this array:
arr=("a" "b" "c" "a" "c")
In this case, "...
- 77
0
votes
2
answers
375
views
Is it possible to use "xargs" to append elements to an array?
I have an empty array
arr=()
Can I use xargs to append elements to this array?
Like this:
echo "test" | xargs arr+=()
- 1
0
votes
1
answer
50
views
Appending to local array
Have defined an array local to a function
isufx+=( -name "*$fltyp" -o )
When I call the function again, the previous values in array isufx are not being cleared and the array unset. ...
- 317
0
votes
2
answers
695
views
Removing last element from bash array
I am calling find by constructing an array isufx containing filename suffixes.
Thusly, I have
echo "isufx: ${isufx[*]}"
that results in
-name *.texi -o -name *.org -o
Finally I got the ...
- 317
2
votes
2
answers
496
views
Mapfile not removing trailing newline
Sample Data: Tab separated tsv file
a.1.58 fadado/CSV https://github.com/fadado/CSV
a.1.63 jehiah/json2csv https://github.com/jehiah/json2csv
a.1.80 stedolan/jq https://github.com/stedolan/jq/...
- 1,362
0
votes
0
answers
34
views
Removing delimiters from bash array elements, then transferring result to another array
I am using an option variable array incl that stores filename extensions.
("--incl")
local incl+=("$2") ; shift 2 ;;
The function can then be called using --incl .texi --...
- 317
2
votes
1
answer
80
views
Can't access elements of an array built from readarray
I'm trying to build a basic REPL in bash.
The script dynamically populates a list of files in a directory for the user to run.
File space:
|
|\ scripts/
|| script1.sh
|| script2.sh
|
\ shell/
| ...
- 23
1
vote
1
answer
164
views
string from array
I have an array named nmser in a bash script and I would like to make a string from it and store it in the variable flsel.
flsel=echo "${nmser[*]}"
- 317
1
vote
1
answer
408
views
Write values with embedded commas from arrays into CSV file using BASH
I am trying to write different arrays into a csv file ($file) columns.
Each array has the same number of values.
For example, arr1 and arr2 have 3 values each
arr1=( 23 45 34 )
arr2=( "abc,d"...
- 11
0
votes
1
answer
66
views
Bash array which contains environment variables to be used as function arguments
I am trying to store some function parameters in a bash array, but some of them are defined from the content of environment variables and they do not actually "expand" to their actual values ...
- 213
0
votes
1
answer
68
views
Write a bash script that displays, for each file given as an argument, the line that appears the most
Write a bash script that displays, for each file given as an argument, the line that appears the most. The display will be made in descending order of the number of occurrences.
I'm not sure how to ...
- 3
7
votes
2
answers
607
views
Bash variables do not expand inside array if declare is used
Recently I decided to read a bit more on the bash built-ins declare, local, and readonly, which led me to switch from:
local variable_name
variable_name='value'
readonly variable_name
To:
...
- 73
0
votes
0
answers
16
views
i can't add the fourth drive in an md array rebuild ans can't find how/why i'm screwed. i would prefer to use the four members than rebuilding 3tb one
sooo, every attempt to mdadm --manage /dev/md0 -f --re-add /dev/loop12p3 ends with
mdadm: hot add failed for /dev/loop12p3: Read-only file system
but all the other loop members are read-only too and ...
4
votes
4
answers
563
views
Read file and store as array without skipping empty strings
File.tsv is a tab delimited file with 7 columns:
cat File.tsv
1 A J 1
2 B K N 1
3 C L O P Q 1
The following reads File.tsv which is tab delimited file ...
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