how Store result of a command in an array and put "none" i the information is missing?-CodePudding

Im using a function that gives me 300 000 lines that look like this :

XXXXXXXXX 
WWWWWWWWWWWW

ZZZZZZZZZZ

eeeeeeeeeee

and i want to get something like this in an array

tab[0]=XXXXXXXXX tab[1]= tab[1]= WWWWWWWWWWWW tab[1]= none

I tried this :

#!/bin/bash
for i in text.txt
do
   tab=[i]
done

CodePudding user response：

Use a while read loop to read the file line by line, and append the line to the tab array.

tab=()
while read -r line; do
    tab =("${line:-none}")
done < filename

:-default in a variable expansion means to use default if the variable is empty, so empty lines will be replaced with none in the array.

CodePudding user response：

Use mapfile to map lines of text to an array:

mapfile -t tab < text.txt

CodePudding user response：

$ readarray -t tab <file
$ declare -p tab
declare -a tab=([0]="XXXXXXXXX " [1]="WWWWWWWWWWWW" [2]="" [3]="ZZZZZZZZZZ" [4]="" [5]="eeeeeeeeeee")

# adding none
$ readarray -t tab < <(awk '{print ($0=="" ? "none" : $0)}' file)
$ declare -p tab
declare -a tab=([0]="XXXXXXXXX" [1]="WWWWWWWWWWWW" [2]="none" [3]="ZZZZZZZZZZ" [4]="none" [5]="eeeeeeeeeee")

# associative array
$ declare -A arr="($(awk '{print ($0=="" ? "[tab,"NR"]=\"none\"" : "[tab,"NR"]=\""$0"\"")}' file))"
$ declare -p arr
declare -A arr=([tab,6]="eeeeeeeeeee" [tab,4]="ZZZZZZZZZZ" [tab,5]="none" [tab,2]="WWWWWWWWWWWW" [tab,3]="none" [tab,1]="XXXXXXXXX" )