Clear out experimental .35 files
Clear out experimental .35 files
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SSED USAGE
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ssed (super-sed) is a customized version of GNU sed which supports
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Perl-style regular expressions and features in its commands for
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s/ubstitu/tion/ and /addressing/. ssed is maintained by Paolo
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Bonzini (bonzini@gnu.org). The latest version of ssed can always be
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found here, on the ssed home page:
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http://sed.sourceforge.net/grabbag/ssed/
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A summary of some of the features supported in ssed:
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(1) Can be used in /addressing/ or on the FIND side of s/// commands:
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\` - matches the beginning of the pattern space: same as "^"
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\' - matches the end of the pattern space: same as "$"
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\? - 0 or 1 occurrences of previous char: same as \{0,1\}
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\+ - 1 or more occurrences of previous char: same as \{1,\}
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\| - matches the string on either side, e.g., foo\|bar
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\b - boundary between word and nonword chars (reversible)
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\B - boundary between 2 word or between 2 nonword chars
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\n - embedded newline (usable after N, G, or similar commands)
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\s - any whitespace character [space, TAB, VT, FF, \n]
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\S - any non-whitespace character
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\w - any word character: same as [A-Za-z0-9_]
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\W - any nonword char: same as [^A-Za-z0-9_]
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\< - boundary between nonword & word char (except in Perl-mode)
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\> - boundary between word & nonword char (except in Perl-mode)
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\(...\) - used for grouping; use ( or ) for literal parentheses
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\{M,N\} - used for interval exps.; use { or } for literal braces
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(2) Supported for -r (extended regex) or -R (Perl-mode). NOTE: the -r
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switch is an undocumented option in GNU sed v3.02+.
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(...) - used for grouping; use \( or \) for literal parentheses
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{M,N} - used for interval exps.; use \{ or \} for literal braces
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? - zero or one, instead of \?
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+ - one or more, instead of \+
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| - alternation, instead of \|
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(3) Can be used in /addressing/ or on EITHER side of an s/// cmd:
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\a - "alert" beep (BEL, Ctrl-G, 0x07)
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\f - formfeed (FF, Ctrl-L, 0x0C)
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\n - newline (LF, Ctrl-J, 0x0A)
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\r - carriage-return (CR, Ctrl-M, 0x0D)
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\t - horizontal tab (HT, Ctrl-I, 0x09)
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\v - vertical tab (VT, Ctrl-K, 0x0B)
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\cx - Ctrl-X (\cb is Ctrl-B, \cP is Ctrl-P, \cV is Ctrl-V, etc.)
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\oNNN - character with the octal value NNN (except in Perl-mode)
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\dNNN - character with the decimal value NNN (except in Perl-mode)
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\xNN - character with the hexadecimal value NN
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(4) Case conversion, used only on the REPLACE side of an s/// command:
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\l - convert next char to lowercase
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\L - convert rest of line to lowercase
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\u - convert next char to uppercase
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\U - convert rest of line to uppercase
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\E - end case conversion begun by \L or \U
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(5) In Perl-mode (-R switch), these become active or inactive:
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\A - matches beginning of pattern space
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\Z - matches end of pattern space or last newline in the PS
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\z - matches end of pattern space
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\d - matches any digit: same as [0-9]
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\D - matches any non-digit: same as [^0-9]
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\` - no longer matches beginning of pattern space
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\' - no longer matches end of pattern space
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\< - no longer matches boundary between nonword & word char
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\> - no longer matches boundary between word & nonword char
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\oNNN - no longer matches char with octal value NNN
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\dNNN - no longer matches char with decimal value NNN
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(6) New switches in /addressing/ or s/// commands. Switches may be
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lowercase in s/// cmds, but must be uppercase in /addressing/.
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/I - ignore case in FIND patterns
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/M - multi-line patterns: ^ or $ will match BOL or EOL
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/S - Perl-mode ONLY: lets "." match a newline also
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/X - Perl-mode ONLY: extra whitespace is ignored. See section (9),
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below, for sample usage.
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(6a) New switches in the s/// command (probably Perl-mode only)
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/e - evaluate the pattern space via a shell command, like Perl
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/ep - evaluate pattern space (as above), then print
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/pe - print pattern space (as above), then evaluate
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/w /dev/stderr - write the results to standard error
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/w /dev/stdout - write the results to standard output
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(7) Perl-style regular expressions, with examples. Use the -R switch.
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Used in /addressing/ or the FIND side of s/// commands.
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(?i)abc - case-insensitive match of abc, ABC, aBc, ABc, etc.
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ab(?i)c - same as above; the (?i) applies throughout the pattern
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(ab(?i)c) - matches abc or abC; the outer parens make the difference!
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(?m) - multi-line pattern space: same as "s/FIND/REPL/M"
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(?s) - set "." to match newline also: same as "s/FIND/REPL/S"
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(?x) - ignore whitespace and #comments; see section (9) below.
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(?:abc)foo - match "abcfoo", but do not capture 'abc' in \1
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(?:ab|cd)ef - match "abef" or "cdef"; only 'cd' is captured in \1
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(?#remark)xy - match "xy"; remarks after "#" are ignored.
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(8) Lookahead (?=match) and lookbehind (?<match) pattern matching.
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NB: the matched text is NOT captured in "&" for s/// replacements!
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foo(?=bar) - match "foo" only if "bar" follows it
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foo(?!bar) - match "foo" only if "bar" does NOT follow it
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(?<=foo)bar - match "bar" only if "foo" precedes it
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(?<!foo)bar - match "bar" only if "foo" does NOT precede it
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(?<!in|on|at)foo
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- match "foo" only if NOT preceded by "in", "on" or "at"
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(?<=\d{3})(?<!999)foo
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- match "foo" only if preceded by 3 digits other than "999"
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(9) Sample use of /X switch to add comments to complex expressions.
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To embed literal spaces, precede with \ or put inside [brackets].
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# ssed script to change "(123) 456-7890" into "[ac123] 456-7890"
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#
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s/ # BACKSLASH IS NEEDED AT END OF EACH LINE! \
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\( # literal left paren, ( \
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(\d{3}) # 3 digits \
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\) # literal right paren, ) \
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[ \t]* # zero or more spaces or tabs \
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(\d{3}-\d{4}) # 3 digits, hyphen, 4 digits \
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/[ac\1] \2/gx; # replace g(lobally), with x(tended spacing)
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#
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# end of script
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summary written by Eric Pement - pemente@northpark.edu
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last updated: 12 March 2003
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[eof]
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