Unix commands for redirection,pipes,filters

2.1. Command-line Special Characters

Quotes and Escape

Join Words "…"

Suppress Filename, Variable Substitution '…'

Escape Character \

Separation, Continuation

Command Separation ;

Command-Line Continuation (at end of line) \

2.2. I/O Redirection and Pipes

Standard Output >

(overwrite if exists) >!

Appending to Standard Output >>

Standard Input <

Standard Error and Output >&

Standard Error Separately

( command > output ) >& errorfile

Pipes/ Pipelines command | filter [ | filter]

Filters

Word/Line Count wc [-l]

Last n Lines tail [-n]

Sort lines sort [-n]

Multicolumn Output pr -t

List Spelling Errors ispell