The content are copied from Gnu Info pages:
- cat invocation:: Concatenate and write files.
- tac invocation:: Concatenate and write files in reverse.
- nl invocation:: Number lines and write files.
- od invocation:: Write files in octal or other format
- fmt invocation:: Reformat paragraph text.
- pr invocation:: Paginate or columnate files for printing.
- fold invocation:: Wrap input lines to fit in specified width
- head invocation:: Output the first part of files.
- tail invocation:: Output the last part of files.
- split invocation:: Split a file into fixed-size pieces.
- csplit invocation:: Split a file into context-determined pieces.
- wc invocation:: Print newline, word, and byte counts.
- sum invocation:: Print checksum and block counts.
- cksum invocation:: Print CRC checksum and byte counts.
- md5sum invocation:: Print or check message-digests.
- sort invocation:: Sort text files.
- uniq invocation:: Uniquify files.
- comm invocation:: Compare two sorted files line by line.
- ptx invocation:: Produce a permuted index of file contents.
- tsort invocation:: Topological sort.
- tsort background:: Where tsort came from.
- cut invocation:: Print selected parts of lines.
- paste invocation:: Merge lines of files.
- join invocation:: Join lines on a common field.
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