CODEWITHSUNDEEP
bashmacossedgreptext-processing
leetbacoon
leetbacoon

Reputation: 1249

Replace first instance of matching text on every line in a txt file

I have a .txt file and I want to replace the first occurrence of a matching string on every line.

So, for example, here's what's inside foo.txt:

838dbc65cd79e16cf09f90abb928e3f3d0ea2d775cf8edc8acaabde6d393bc76  /Volumes/Documents - Part 1/legos.png
415ccf1e05fb5985d2f719deabec7bb5d22aeaac7b82cca885010b12d483d997  /Volumes/Documents - Part 1/folder/Volumes/Documents - Part 1/another folder/Volumes/Documents - Part 1 BU/fedora linux.7z
f3d0ea2d775cf8edc1ddbd76e2562d3e4a2e281fe2aeb1333ef99536d1a180ee  /Volumes/Documents - Part 1/manuals/dryer.pdf
\ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad  /Volumes/Documents - Part 1/Test Hash Folder/#;."'&,\\{2}:`!*?$(){}[]<>|-=+% [meowzers] (1)~^^.$[E-frLOL[MAY[]{}()?<NUL>
\9c993445f7f6216b4fc7d35aef47afa16f4f831f2510b7fddd1e42c4cafb518c  /Volumes/Documents - Part 1/Test Hash Folder/#;."'&,\\:`!CAT      MEOW!!![hey]{15}(hello)@$%&^*(#@@*?$(){}[]<>|-=+% ~^^.$[E-frLOL[MAY[]{}()?<NUL>

I want to replace Documents - Part 1 with Documents - Part 1 BU, but only the first occurrence on every line.

So, it would look like this in the end:

838dbc65cd79e16cf09f90abb928e3f3d0ea2d775cf8edc8acaabde6d393bc76  /Volumes/Documents - Part 1 BU/legos.png
415ccf1e05fb5985d2f719deabec7bb5d22aeaac7b82cca885010b12d483d997  /Volumes/Documents - Part 1 BU/folder/Volumes/Documents - Part 1/another folder/Volumes/Documents - Part 1 BU/fedora linux.7z
f3d0ea2d775cf8edc1ddbd76e2562d3e4a2e281fe2aeb1333ef99536d1a180ee  /Volumes/Documents - Part 1 BU/manuals/dryer.pdf
\ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad  /Volumes/Documents - Part 1 BU/Test Hash Folder/#;."'&,\\{2}:`!*?$(){}[]<>|-=+% [meowzers] (1)~^^.$[E-frLOL[MAY[]{}()?<NUL>
\9c993445f7f6216b4fc7d35aef47afa16f4f831f2510b7fddd1e42c4cafb518c  /Volumes/Documents - Part 1 BU/Test Hash Folder/#;."'&,\\:`!CAT      MEOW!!![hey]{15}(hello)@$%&^*(#@@*?$(){}[]<>|-=+% ~^^.$[E-frLOL[MAY[]{}()?<NUL>

I tried this:

cat foo.txt | grep "^.[\]{64}  /Volumes/Documents - Part 1/" | sed "  /Volumes/Documents - Part 1 BU"`

but it didn't work. How can I fix this?

Mac OS X Yosemite, bash 3.2.57(1)-release, grep (BSD grep) 2.5.1-FreeBSD

Upvotes: 3

Views: 684

Answers (1)

RavinderSingh13
RavinderSingh13

Reputation: 133630

Solution 1st: Following sed may help you on same.

sed 's/Documents - Part 1/Documents - Part 1 BU/'   Input_file

Solution 2nd: awk solution.

awk '{sub("Documents - Part 1","Documents - Part 1 BU")} 1'   Input_file

NOTE: Use sed -i option in above code in case you want to save output into Input_file itself and append > temp_file && mv temp_file Input_file to 2nd solution for doing the same.

Upvotes: 5

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