csplit

Split a file into pieces. This generates files named “xx00”, “xx01”, and so on. More information: https://www.gnu.org/software/coreutils/csplit.

• Split a file at lines 5 and 23:

csplit path/to/file 5 23

• Split a file every 5 lines (this will fail if the total number of lines is not divisible by 5):

csplit path/to/file 5 {*}

• Split a file every 5 lines, ignoring exact-division error:

csplit -k path/to/file 5 {*}

• Split a file at line 5 and use a custom prefix for the output files:

csplit path/to/file 5 -f prefix

• Split a file at a line matching a regular expression:

csplit path/to/file /regular_expression/