SED Command Synopsis Continued: Addresses and Command Ranges

version 3 or later <https://gnu.org/li‐ censes/gpl.html>. This is free software: you are free to change and re‐ distribute it. There is NO WARRANTY, to the extent permitted by law. COMMAND SYNOPSIS This is just a brief synopsis of sed commands to serve as a reminder to those who already know sed; other documentation (such as the texinfo document) must be consulted for fuller descriptions. Zero‐address ‘‘commands’’ : label Label for b and t commands. #comment The comment extends until the next newline (or the end of a -e script fragment). } The closing bracket of a { } block. Zero‐ or One‐ address commands = Print the current line number. a \ text Append text, which has each embedded newline preceded by a back‐ slash. i \ text Insert text, which has each embedded newline preceded by a back‐ slash. q [exit‐code] Immediately quit the sed script without processing any more in‐ put, except that if auto‐print is not disabled the current pat‐ tern space will be printed. The exit code argument is a GNU ex‐ tension. Q [exit‐code] Immediately quit the sed script without processing any more in‐ put. This is a GNU extension. r filename Append text read from filename. R filename Append a line read from filename. Each invocation of the command reads a line from the file. This is a GNU extension. Commands which accept address ranges { Begin a block of commands (end with a }). b label Branch to label; if label is omitted, branch to end of script. c \ text Replace the selected lines with text, which has each embedded newline preceded by a backslash. d Delete pattern space. Start next cycle. D If pattern space contains no newline, start a normal new cycle as if the d command was issued. Otherwise, delete text in the pat‐ tern space up to the first newline, and restart cycle with the resultant pattern space, without reading a new line of input. h H Copy/append pattern space to hold space. g G Copy/append hold space to pattern space. l List out the current line in a ‘‘visually unambiguous’’ form. l width List out the current line in a ‘‘visually unambiguous’’ form, breaking it at width characters. This is a GNU extension. n N Read/append the next line of input into the pattern space. p Print the current pattern space. P Print up to the first embedded newline of the current pattern space. s/regexp/replacement/ Attempt to match regexp against the pattern space. If success‐ ful, replace that portion matched with replacement. The replace‐ ment may contain the special character & to refer to that portion of the pattern space which matched, and the special escapes \1 through \9 to refer to the corresponding matching sub‐expressions in the regexp. t label If a s/// has done a successful substitution since the last input line was read and since the last t or T command, then branch to label; if label is omitted, branch to end of script. T label If no s/// has done a successful substitution since the last in‐ put line was read and since the last t or T command, then branch to label; if label is omitted, branch to end of script. This is a GNU extension. w filename Write the current

This section continues the synopsis of `sed` commands, detailing zero-address, one-address, and commands that accept address ranges. It includes commands for quitting the script, appending text from files, branching to labels, replacing lines, deleting pattern space content, manipulating hold space, listing lines, reading/appending input lines, printing pattern space, and performing substitutions using regular expressions. It also covers conditional branching based on successful substitutions and writing pattern space content to a file.