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How to add a line of text containing the filename to all text files recursively in terminal?

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How to make sed -i work in both Mac and Ubuntu?

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using sed how to put space after numbers in a big string

bash sed awk

Delete all contents of the file using sed

unix sed empty-list

awk and sed challenge: adjust the text width

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How to remove block text between 2 patterns?

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Perl/Sed command to replace same pattern multiple times

regex perl awk sed ubuntu-16.04

Do various substitutions but only before a character

regex bash awk sed

awk/sed: repeat 1st column for each column

awk sed vim

How to extract all variables from file

regex awk sed grep

How to find a chunk of string that starts with $PATTERN and ends with $LINEBREAK

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sed (or awk) regular expression to replace substring of match

regex sed awk

convert first column in a csv file from timestamp to year-month format

bash awk sed

How to iteratively find number of lines between two patterns?

bash awk sed

awk/sed/shell to merge/concatenate data

join sed awk

Insert a string on a new line after a pattern

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sed insert content of a file after a line specified by number

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Replace a line that starts with something with something else, via sed

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Printing first and last match in file

bash awk sed grep