ED editor ED file - "-" Suppress line/byte count messages (for in scripts) ed prog.c Edit prog.c echo '1,$p' | ed - file Odd way to write 'cat file' Ed is functionally equivalent to the standard UNIX V7 editor, ed. It supports the following commands: (.)a: append (.,.)c: change (.,.)d: delete e: edit new file" f: print name of edited file" (1,$)g: global command (.)i: insert (.,.+1)j: join lines together (.)k: mark (.)l: print with special characters in octal (.,.)m: move (.,.)p: print q: quit editor" (.)r: read in new file (.,.)s: substitute (1,$)v: like g, except select lines that do not match (1,$)w: write out edited file Many of the commands can take one or two addresses, as indicated above. The defaults are shown in parentheses. Thus a appends to the current line, and g works on the whole file as default. The dot refers to the current line. Below is a sample editing session with comments given following the # symbol. ed prog.c# Edit prog.c 3,20p# Print lines 3 through 20 /whole/# Find next occurence of whole s/whole/while/# Replace whole by while g/Buf/s//BUF/g# Replace Buf by BUF everywhere w# Write the file back q# Exit the editor Ed is provided for its sentimental value.