[SOLVED] How to get value after ' = ' using sed command

Issue

How to get a value after remember= using shell script from the following case:

case 1:

    String= " password   sufficient  shape sha512 remember=5"

case 2:

     String= " password   sufficient shape remember=5 sha512"

How I use sed command to get a value after = from the both cases. the output should be 5

Solution

With sed: just match whole the string with the remember= followed by the backreference. Inside the backreference match the characters you want to match the value. And substitute the whole string for the backreference.

String=" password   sufficient shape remember=5 sha512"
sed 's/.*remember=\([0-9]\{1,\}\).*/\1/' <<<"$String"

would output:

5

With bash: Remove everything up until remember= and then remove everything from the back up until a space:

String=" password   sufficient shape remember=5 sha512"
a=${String##*remember=};
a=${a%% *};
echo $a

In awk: iterate over the arguments and check if it's an "remember". Then extract the data after the =:

String=" password   sufficient shape remember=5 def";
<<<"$String" awk '{ for (i=0;i<=NF;++i) { b=$i; c=$i; gsub(/=.*/, "", b); if (b == "remember") { gsub(/.*=/, "", c); print c; } } }'

Note: the both similar source lines from your question

   String= " password   sufficient  shape sha512 remember=5"

Both give me similar

bash:  password   sufficient  shape sha512 remember=5: command not found

error.

Answered By - KamilCuk