Display output of `time` only if command after `time` was successful












4















I want the output of the time command to be shown only if the command, which has been passed to time was successful. Something like this:



( time wget -pq --delete-after https://www.example.com ) 2>&1 || echo fail


The problem is, that if wget fails, I still receive the output from time (which is somewhere logical, as it measures how long it took for the command to fail anyway). My goal is to save the output to a variable and either have 0m0.100s or fail in my variable. Does anyone has an idea how I could do this in a decent manner?






command-line time return-status







share|improve this question





























    4















    I want the output of the time command to be shown only if the command, which has been passed to time was successful. Something like this:



    ( time wget -pq --delete-after https://www.example.com ) 2>&1 || echo fail


    The problem is, that if wget fails, I still receive the output from time (which is somewhere logical, as it measures how long it took for the command to fail anyway). My goal is to save the output to a variable and either have 0m0.100s or fail in my variable. Does anyone has an idea how I could do this in a decent manner?






    command-line time return-status







    share|improve this question



























      4












      4








      4


      1






      I want the output of the time command to be shown only if the command, which has been passed to time was successful. Something like this:



      ( time wget -pq --delete-after https://www.example.com ) 2>&1 || echo fail


      The problem is, that if wget fails, I still receive the output from time (which is somewhere logical, as it measures how long it took for the command to fail anyway). My goal is to save the output to a variable and either have 0m0.100s or fail in my variable. Does anyone has an idea how I could do this in a decent manner?






      command-line time return-status







      share|improve this question
















      I want the output of the time command to be shown only if the command, which has been passed to time was successful. Something like this:



      ( time wget -pq --delete-after https://www.example.com ) 2>&1 || echo fail


      The problem is, that if wget fails, I still receive the output from time (which is somewhere logical, as it measures how long it took for the command to fail anyway). My goal is to save the output to a variable and either have 0m0.100s or fail in my variable. Does anyone has an idea how I could do this in a decent manner?






      command-line time return-status




      command-line time return-status






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited 5 hours ago







      chevallier

















      asked 6 hours ago









      chevallierchevallier

      9511323




      9511323






















          1 Answer
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          3














          You can do something like this:



          $ if var=$( { time true; } 2>&1 ); then echo "$var"; else echo fail; fi
          

          
real    0m0.000s
          
user    0m0.000s
          
sys 0m0.000s
          




          $ if var=$( { time false; } 2>&1 ); then echo "$var"; else echo fail; fi
          
fail





          share|improve this answer





















          • 2





            var=$( { time sleep 1; } 2>&1 ) should work with Bash, ksh and zsh (though time true doesn't print anything in my zsh, hmm)

            – ilkkachu
            5 hours ago











          Your Answer








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          1 Answer
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          active

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          1 Answer
          1






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          3














          You can do something like this:



          $ if var=$( { time true; } 2>&1 ); then echo "$var"; else echo fail; fi
          

          
real    0m0.000s
          
user    0m0.000s
          
sys 0m0.000s
          




          $ if var=$( { time false; } 2>&1 ); then echo "$var"; else echo fail; fi
          
fail





          share|improve this answer





















          • 2





            var=$( { time sleep 1; } 2>&1 ) should work with Bash, ksh and zsh (though time true doesn't print anything in my zsh, hmm)

            – ilkkachu
            5 hours ago
















          3














          You can do something like this:



          $ if var=$( { time true; } 2>&1 ); then echo "$var"; else echo fail; fi
          

          
real    0m0.000s
          
user    0m0.000s
          
sys 0m0.000s
          




          $ if var=$( { time false; } 2>&1 ); then echo "$var"; else echo fail; fi
          
fail





          share|improve this answer





















          • 2





            var=$( { time sleep 1; } 2>&1 ) should work with Bash, ksh and zsh (though time true doesn't print anything in my zsh, hmm)

            – ilkkachu
            5 hours ago














          3












          3








          3







          You can do something like this:



          $ if var=$( { time true; } 2>&1 ); then echo "$var"; else echo fail; fi
          

          
real    0m0.000s
          
user    0m0.000s
          
sys 0m0.000s
          




          $ if var=$( { time false; } 2>&1 ); then echo "$var"; else echo fail; fi
          
fail





          share|improve this answer















          You can do something like this:



          $ if var=$( { time true; } 2>&1 ); then echo "$var"; else echo fail; fi
          

          
real    0m0.000s
          
user    0m0.000s
          
sys 0m0.000s
          




          $ if var=$( { time false; } 2>&1 ); then echo "$var"; else echo fail; fi
          
fail






          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited 5 hours ago

























          answered 5 hours ago









          Jesse_bJesse_b

          12.6k23066




          12.6k23066








          • 2





            var=$( { time sleep 1; } 2>&1 ) should work with Bash, ksh and zsh (though time true doesn't print anything in my zsh, hmm)

            – ilkkachu
            5 hours ago














          • 2





            var=$( { time sleep 1; } 2>&1 ) should work with Bash, ksh and zsh (though time true doesn't print anything in my zsh, hmm)

            – ilkkachu
            5 hours ago








          2




          2





          var=$( { time sleep 1; } 2>&1 ) should work with Bash, ksh and zsh (though time true doesn't print anything in my zsh, hmm)

          – ilkkachu
          5 hours ago





          var=$( { time sleep 1; } 2>&1 ) should work with Bash, ksh and zsh (though time true doesn't print anything in my zsh, hmm)

          – ilkkachu
          5 hours ago


















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