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If bar may occur on consecutive lines, you could do:

awk '/bar/{n=2}; n {n--; next}; 1' < infile > outfile 

which can be adapted to delete more than 2 lines by changing the 2 above with the number of lines to delete including the matching one.

If not, it's easily done in sed with @MichaelRollins' solution or:

sed '/bar/,/^/d' < infile > outfile 

If bar may occur on consecutive lines, you could do:

awk '/bar/{n=2}; n {n--; next}; 1' < infile > outfile 

which can be adapted to delete more than 2 lines by changing the 2 above with the number of lines to delete including the matching one.

If not, it's easily done in sed with @MichaelRollins' solution or:

sed '/bar/,/^/d' < infile > outfile 

If bar may occur on consecutive lines, you could do:

awk '/bar/{n=2}; n {n--; next}; 1' < infile > outfile 

which can be adapted to delete more than 2 lines by changing the 2 above with the number of lines to delete including the matching one.

If not, it's easily done in sed with @MichaelRollins' solution or:

sed '/bar/,/^/d' < infile > outfile 

If bar may occur on consecutive lines, you could do:

awk '/bar/{n=2}; n {n--; next}; 1' < infile > outfile 

which can be adapted to delete more than 2 lines by changing the 2 above with the number of lines to delete including the matching one.

If not, it's easily done in sed with @MichaelRollins' solution or:

sed '/bar/,/^/d' < infile > outfile 

If bar may occur on consecutive lines, you could do:

awk '/bar/{n=2}; n {n--; next}; 1' < infile > outfile 

which can be adapted to delete more than 2 lines by changing the 2 above with the number of lines to delete including the matching one.

If bar may occur on consecutive lines, you could do:

awk '/bar/{n=2}; n {n--; next}; 1' < infile > outfile 

which can be adapted to delete more than 2 lines by changing the 2 above with the number of lines to delete including the matching one.

If not, it's easily done in sed with @MichaelRollins' solution or:

sed '/bar/,/^/d' < infile > outfile