Usage sed
Insert a line (2nd line)
sed -i -e "2i\test-insertion-line" name-file
Delete a line begin
sed -i -e '/^test-insertion-line/d'
Delete comment lines in file
sed -e '/^[ ]*#/d' -e '/^$/d' file.txt > file.new
Insert a line (2nd line)
sed -i -e "2i\test-insertion-line" name-file
Delete a line begin
sed -i -e '/^test-insertion-line/d'
Delete comment lines in file
sed -e '/^[ ]*#/d' -e '/^$/d' file.txt > file.new
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