CODEWITHSUNDEEP
linuxbashecho
NStorm
NStorm

Reputation: 2528

Save one line of echo to variable in BASH?

Okay the answer to this may be really simple but I have been searching for a while and I can't figure it out. I have a variable called "tmessagef". The variable is formatted like:

value1*value2*vlaue3*value4*value5

The only part of the variable I want is value 5. I am currently using the following code but it only prints each value and doesn't save them to a variable:

OIFS=$IFS
IFS='*'
arr2=$tmessagef
for x in $arr2
do
    echo "$x"
done
IFS=$OIFS

What I want to do is get the 5th line that the echo command produces and save that to a variable called "tmessage". How would I go about doing this?

Thanks in advance.

Upvotes: 0

Views: 2812

Answers (5)

foamdino
foamdino

Reputation: 360

Can you use cut?

VAL=`echo 'value1*value2*vlaue3*value4*value5' | cut -f5 -d'*'`

Upvotes: 0

JJJollyjim
JJJollyjim

Reputation: 6207

I believe mcalex's comment should answer it:

Change echo "$x" to tmessage="$x". At the end of the loop $val will contain the last value

Upvotes: 0

doubleDown
doubleDown

Reputation: 8398

For this very specific scenario (where you only want to extract the value at the very end), you can use parameter expansion

echo "${word##*\*}"

or assign it to a variable instead of using "echo".

Explanation:

  • ## removes the longest substring anchored at the beginning that matches the pattern
  • * matches any number of any character
  • \* matches a literal asterisk

So basically, remove the longest substring that ends with an asterisk.

Upvotes: 1

ormaaj
ormaaj

Reputation: 6577

IFS=* read -r _{,,,} tmessage _ <<<"$tmessagef"

or

[[ $tmessagef =~ ^(.*\*){4}(.*)\* ]]; tmessage=${BASH_REMATCH[2]}

Read http://mywiki.wooledge.org/BashFAQ/001 and the trillion other answers to this question.

Don't use echo for this. If you have output that needs saving, see: http://mywiki.wooledge.org/BashFAQ/002

Upvotes: 0

nneonneo
nneonneo

Reputation: 179392

Array manipulation:

OIFS="$IFS" IFS='*' Y=($X)
x=${Y[${#Y[@]}-1]}
IFS="$OIFS"

Upvotes: 1

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