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    are your first backtick and the '.' reversed? Commented Apr 1, 2017 at 21:46
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    As noted by @user208145, you have a typo. you need mystring_$socket='./forked_sh.sh' (with backticks). Or better: mystring_$socket=$(./forked_sh.sh) Commented Apr 1, 2017 at 21:55
  • Welcome to Unix & Linux Stack Exchange. It would appear that you have accidentally created two accounts. You should use the contact form and select “I need to merge user profiles” to have your accounts merged. In order to merge them, you will need to provide links to the two accounts.  For your information, they are unix.stackexchange.com/users/223919/kapil-dev and unix.stackexchange.com/users/223922/kapil-dev. You’ll then be able to edit, comment on, and accept answers to this question. Commented Apr 2, 2017 at 0:12