Bash Arrays

calendar Jan 24, 2024 · 1 min read · bash  ·
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BASH Arrays

See here.

1names[0]=Yoesf
2names[1]=David
3echo $names        # will show: Yosef
4echo ${names[1]}   # will show: David
bash

Assigning complete arrays. This is done by surounding a list of word with parentheses:

1-> girlz=(Betty Liza Jane)
2-> echo ${girlz[2]}
3Jane
4-> echo ${girlz}
5Betty
6->
bash

or even:

1-->allfiles=(`ls`)
2-->echo ${allfiles[0]}
3countries
4-->echo ${allfiles[1]}
5demo1
6-->
bash

You have to use declare -A name before:

 1-> declare -A menheight
 2-> menheight[Dave]=195
 3-> menheight[Sean]=170
 4-> menheight[Bob]=180
 5-> echo ${menheight[Dave]}
 6195
 7-> echo ${menheight[Sean]}
 8170
 9-> echo ${menheight[Bob]}
10180
11->
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Use "!" to get values:

1-> echo ${menheight[@]}
2195 170180
3-> echo "${!menheight[@]}"
4Dave Sean Bob
5->
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Loop over elements:

 1-> for key in ${menheight[@]}; do printf "%s %s\n" $key ${menheight[$key]}; done
 2195 
 3170 
 4180 
 5-> 
 6-> 
 7-> 
 8-> for key in "${!menheight[@]}"; do printf "%s %s\n" $key ${menheight[$key]}; done
 9Dave 195
10Sean 170
11Bob 180
12->
bash