bash - Way to change xargs arguments to include a flag per argument? -

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i have passing experience xargs, don't quite know how this:

  • i have list of archives retrieved tarsnap using tarsnap --list-archives
  • i want delete archives day (there 24 made each day)

i can use xargs accomplish this:

tarsnap --list-archives | grep 2014-06-09 | xargs -n 1 tarsnap -df

however runs tarsnap on , on again 1 argument @ time (which expected):

tarsnap -df 2014-06-09-00 tarsnap -df 2014-06-09-01 tarsnap -df 2014-06-09-02 ... etc ...

the tarsnap documentation states can delete multiple archives passing in multiple -f flags:

tarsnap -d -f 2014-06-09-00 -f 2014-06-09-01 -f 2014-06-09-02 # ... , on

is there way accomplish xargs?

(aside: might pointless this, since have feeling running tarsnap multiple -f flags causes tarsnap run multiple times, 1 argument @ time... wrong)

using idea quite similar @choroba's, can rid of grep altogether , use sed instead:

tarsnap --list-archives | sed -n '/2014-06-09/s/^/-f /p' | xargs tarsnap -d

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