bash - regex and grep match only string with valid port in an if loop -


I am trying to check in a bass script if I am getting a curl response then give me a valid IANA port If it is, then I want to break the loop and continue. If this does not give me a port, then I want to delete it and try again after a sleepy period.

My problem is grep and regex query. I'm still learning regex and not sure if I got this right. Can anyone verify it. (Or offer an easy solution to the same problem.) 

  port_forwarding_assignment = / home / user / port_forwarding_assignment.txt while [! -f "$ port_forwarding_assignment"]; Sudo Curl- "Post_datastast" Https: // website / port_forward_assignment -o "/home/user/port_forwarding_assignment.txt" if [grep -q '^ port (6553 [0-5] | 655 [0-2] \ d | 65 [0-4] \ D \ d | 6 [0-4] \ d {3} | [1-5] \ d {4} | [1- 9] \ d {0,3} | 0) $ '' $ port_forwarding_assignment]] ; Then fire RM-F / Home / User / Port / Forwarding_signment. End TST 30

< Some comments on P> code: < / P>
  • [ Characters in bash are actually short stories for the builtin test command, then you should have a place after this. Code> if [... .
  • but if tests the return code of your logic, then you actually do not [grep < / Code>. Instead, simply type: to test the return code from grep -q ... grep .
  • To use the repetition in grep, you need to use either -E or \ {... <} ( Or for example using short for grep -E ).
  • Output to a file but then you have to handle that case which gives curl an error, possibly with PIPESTATUS .
  • Not sure why you sudo for this

Write a rewrite according to the first 3 comments: 

  port_forwarding_assignment = / home / user / port_forwarding_assignment.txt while [! -f "$ port_forwarding_assignment"]; Do sudo curl -d "post_data_stuff" https: // website / port_forward_assignment -o "/home/user/port_forwarding_assignment.txt" if grep -qE 'port (6553 [0-5] | 655 [0-2] \ D | 65 [0-4] \ d \ d | 6 [0-4] \ d {3} | [1-5] \ d {4} | [1-9] \ d {0.3} | 0) $ '' $ Port_forwarding_assignment "; Again fire RM-F / Home / User / Port / Forwarding_signment. End test 30

Since you are not seeing the return code return code, you can also make changes according to my 4th comment all five comments The following code has been applied: 

  port_forwarding_assignment = / home / user / port_forwarding_assignment.txt while! Curl-d "post_data_stoff" https: // website / port_favourword_sagmentement | T "$ port_forwarding_assignment" | Grep -qE 'port (6553 [0-5] | 655 [0-2] \ d | 65 [0-4] \ d \ d | 6 [0-4] \ d {3} | [1-5] \ D {4} | [1- 9] \ d {0,3} | $) $ 'Dale Sleep 30 has been completed

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