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I am trying to get rid of the first two lines of multiple text files. I know the command to do it for just one file using

sed -i '1,2d' filename.dat

But how can I run this command for multiple files? Can I do this using .sh file?

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sed takes multiple file names as arguments. Just pass them along:

sed -i '1,2d' file1.txt file2.txt file3.txt

If you file names follow a certain pattern, you can take help from shell globbing e.g. for the above:

sed -i '1,2d' file{1..3}.txt

For all .dat files in the current directory:

sed -i '1,2d' *.dat
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    Note for those wishing to simulate this without the -i (--in-place) option, you will need to add the -s (--separate) flag, otherwise only the first two lines of the first input file will be affected (-i with multiple files implies -s since it wouldn't make sense otherwise). Aug 23 '16 at 14:59

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