Tr

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Concatenate lines on a file:

cat file | tr '\n' ' '

Concatenate/merge every 2 lines:

cat /path/tofile.txt | paste -d " "  - -[1]


cat file | tr '\n' 
tr: when not truncating set1, string2 must be non-empty

Related commands

See also

  • https://stackoverflow.com/a/9605450
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