unix - Removing every character in .txt that isn't enclosed by pipes ( | ) OR where the line starts with # -


i've got bunch of .txt files this: 

 # title: got stripes    # artist: johnny cash    # metre: 4/4    # tonic: db    0.000000000 silence   0.348299319 a, intro, | cb:maj | db:maj | db:maj |, (guitar)   3.931269841 b, verse, | db:maj | db:maj | ab:maj | ab:maj |, (voice 8.662993197 | ab:maj | ab:maj | db:maj | db:maj |    # tonic: eb   78.145873015    d, modulation, | eb:maj | eb:maj |, (guitar)   80.474625850    b, verse, | eb:maj | eb:maj | bb:maj | bb:maj |, (voice   85.104784580    | bb:maj | bb:maj | eb:maj | eb:maj |

and need convert them this:

  # title: got stripes     # artist: johnny cash     # metre: 4/4     # tonic: db    | cb:maj | db:maj | db:maj |   | db:maj | db:maj | ab:maj | ab:maj |   | ab:maj | ab:maj | db:maj | db:maj |     # tonic: eb   | eb:maj | eb:maj |   | eb:maj | eb:maj | bb:maj | bb:maj |   | bb:maj | bb:maj | eb:maj | eb:maj |

specifically, means:

  • every line starts # needs stay same
  • every blank line (such line 5 in mock example) needs stay there
  • for other lines, every character isn't enclosed pipes ( | ) needs removed

i have +/- 700 files, in different subdirectories.

i thinking of writing sed script, can't quite figure out how it.

using sed:

sed '/^ *#/b;s/^[^|]*//;s/[^|]*$//' filename

how works:

  • if line begins # (with optional spaces before #), branch next cycle (i.e. don't anything)
  • remove beginning of line |
  • remove end of line before |

if using bsd sed, split up:

sed -e '/^ *#/b' -e 's/^[^|]*//;s/[^|]*$//;' filename

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