Bash - How to put an array inside values of variable?

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0
down vote

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I have a web.txt file which contains:



youtube
facebook
google


My sh file contains:



readarray web < web.txt
url = www.website.com


Commands I have used:



readarray web < web.txt
url = www."$web".com

ping url


Expected output:



ping youtube.com
ping facebook.com
ping google.com


What should be the right syntax? Thanks!






shell variable array







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  • mywiki.wooledge.org/BashFAQ/001
    – jasonwryan
    3 hours ago










  • your problem has nothing to do with arrays ..... the problem is with bash parameter substitution
    – jsotola
    3 hours ago















up vote
0
down vote

favorite












I have a web.txt file which contains:



youtube
facebook
google


My sh file contains:



readarray web < web.txt
url = www.website.com


Commands I have used:



readarray web < web.txt
url = www."$web".com

ping url


Expected output:



ping youtube.com
ping facebook.com
ping google.com


What should be the right syntax? Thanks!






shell variable array







share|improve this question









New contributor




Ben is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.



















  • mywiki.wooledge.org/BashFAQ/001
    – jasonwryan
    3 hours ago










  • your problem has nothing to do with arrays ..... the problem is with bash parameter substitution
    – jsotola
    3 hours ago













up vote
0
down vote

favorite









up vote
0
down vote

favorite











I have a web.txt file which contains:



youtube
facebook
google


My sh file contains:



readarray web < web.txt
url = www.website.com


Commands I have used:



readarray web < web.txt
url = www."$web".com

ping url


Expected output:



ping youtube.com
ping facebook.com
ping google.com


What should be the right syntax? Thanks!






shell variable array







share|improve this question









New contributor




Ben is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











I have a web.txt file which contains:



youtube
facebook
google


My sh file contains:



readarray web < web.txt
url = www.website.com


Commands I have used:



readarray web < web.txt
url = www."$web".com

ping url


Expected output:



ping youtube.com
ping facebook.com
ping google.com


What should be the right syntax? Thanks!






shell variable array




shell variable array






share|improve this question









New contributor




Ben is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question









New contributor




Ben is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









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edited 3 hours ago









steeldriver

33.4k34982




33.4k34982






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asked 3 hours ago









Ben

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New contributor





Ben is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






Ben is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











  • mywiki.wooledge.org/BashFAQ/001
    – jasonwryan
    3 hours ago










  • your problem has nothing to do with arrays ..... the problem is with bash parameter substitution
    – jsotola
    3 hours ago

















  • mywiki.wooledge.org/BashFAQ/001
    – jasonwryan
    3 hours ago










  • your problem has nothing to do with arrays ..... the problem is with bash parameter substitution
    – jsotola
    3 hours ago
















mywiki.wooledge.org/BashFAQ/001
– jasonwryan
3 hours ago




mywiki.wooledge.org/BashFAQ/001
– jasonwryan
3 hours ago












your problem has nothing to do with arrays ..... the problem is with bash parameter substitution
– jsotola
3 hours ago





your problem has nothing to do with arrays ..... the problem is with bash parameter substitution
– jsotola
3 hours ago











1 Answer
1






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up vote
3
down vote













If you really want to print the expected output shown, then



$ readarray -t web < web.txt
$ printf 'ping www.%s.comn' "$web[@]"
ping www.youtube.com
ping www.facebook.com
ping www.google.com


However if you want to actually ping the hosts, the probably xargs is simpler e.g.



xargs -a web.txt -I ping -c1 "www..com"





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    1 Answer
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    active

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    1 Answer
    1






    active

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    active

    oldest

    votes








    up vote
    3
    down vote













    If you really want to print the expected output shown, then



    $ readarray -t web < web.txt
    $ printf 'ping www.%s.comn' "$web[@]"
    ping www.youtube.com
    ping www.facebook.com
    ping www.google.com


    However if you want to actually ping the hosts, the probably xargs is simpler e.g.



    xargs -a web.txt -I ping -c1 "www..com"





    share|improve this answer
























      up vote
      3
      down vote













      If you really want to print the expected output shown, then



      $ readarray -t web < web.txt
      $ printf 'ping www.%s.comn' "$web[@]"
      ping www.youtube.com
      ping www.facebook.com
      ping www.google.com


      However if you want to actually ping the hosts, the probably xargs is simpler e.g.



      xargs -a web.txt -I ping -c1 "www..com"





      share|improve this answer






















        up vote
        3
        down vote










        up vote
        3
        down vote









        If you really want to print the expected output shown, then



        $ readarray -t web < web.txt
        $ printf 'ping www.%s.comn' "$web[@]"
        ping www.youtube.com
        ping www.facebook.com
        ping www.google.com


        However if you want to actually ping the hosts, the probably xargs is simpler e.g.



        xargs -a web.txt -I ping -c1 "www..com"





        share|improve this answer












        If you really want to print the expected output shown, then



        $ readarray -t web < web.txt
        $ printf 'ping www.%s.comn' "$web[@]"
        ping www.youtube.com
        ping www.facebook.com
        ping www.google.com


        However if you want to actually ping the hosts, the probably xargs is simpler e.g.



        xargs -a web.txt -I ping -c1 "www..com"






        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered 3 hours ago









        steeldriver

        33.4k34982




        33.4k34982




















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