HANDY ONE-LINERS FOR SED (Unix stream editor) Mar. 23, 2001.compiled by Eric Pement <pemente@northpark.edu> version 5.1 .Latest version of this file is usually at:
http://www.student.northpark.edu/pemente/sed/sed1line.txt
http://www.cornerstonemag.com/sed/sed1line.txt
This file is also available in Portuguese at:
http://www.lrv.ufsc.br/wmaker/sed_ptBR.html

FILE SPACING-----------------:
# double space a file
sed G

# double space a file which already has blank lines in it. Output file
# should contain no more than one blank line between lines of text.
sed \'/^$/d;G\'

# triple space a file
sed \'G;G\'

# undo double-spacing (assumes even-numbered lines are always blank)
sed \'n;d\'

NUMBERING:

# number each line of a file (simple left alignment). Using a tab (see
# note on \'\\t\' at end of file) instead of space will preserve margins.
sed = filename | sed \'N;s/\\n/\\t/\'

# number each line of a file (number on left, right-aligned)
sed = filename | sed \'N; s/^/ /; s/ *\\(.\\{6,\\}\\)\\n/\\1 /\'

# number each line of file, but only print numbers if line is not blank
sed \'/./=\' filename | sed \'/./N; s/\\n/ /\'

# count lines (emulates \"wc -l\")
sed -n \'$=\'

TEXT CONVERSION AND SUBSTITUTION:

# IN UNIX ENVIRONMENT: convert DOS newlines (CR/LF) to Unix format
sed \'s/.$//\' # assumes that all lines end with CR/LF
sed \'s/^M$//\' # in bash/tcsh, press Ctrl-V then Ctrl-M
sed \'s/\\x0D$//\' # gsed 3.02.80, but top s cript is easier

# IN UNIX ENVIRONMENT: convert Unix newlines (LF) to DOS format
sed \"s/$/`echo -e \\\\\\r`/\" # command line under ksh
sed \'s/$\'\"/`echo \\\\\\r`/\" # command line under bash
sed \"s/$/`echo \\\\\\r`/\" # command line under zsh
sed \'s/$/\\r/\' # gsed 3.02.80

# IN DOS ENVIRONMENT: convert Unix newlines (LF) to DOS format
sed \"s/$//\" # method 1
sed -n p # method 2

# IN DOS ENVIRONMENT: convert DOS newlines (CR/LF) to Unix format
# Cannot be done with DOS versions of sed. Use \"tr\" instead.
tr -d \\r <infile >outfile # GNU tr version 1.22 or higher

# delete leading whitespace (spaces, tabs) from front of each line
# aligns all text flush left
sed \'s/^[ \\t]*//\' # see note on \'\\t\' at end of file

# delete trailing whitespace (spaces, tabs) from end of each line
sed \'s/[ \\t]*$//\' # see note on \'\\t\' at end of file

# delete BOTH leading and trailing whitespace from each line
sed \'s/^[ \\t]*//;s/[ \\t]*$//\'

# insert 5 blank spaces at beginning of each line (make page offset)
sed \'s/^/ /\'

# align all text flush right on a 79-column width
sed -e :a -e \'s/^.\\{1,78\\}$/ &/;ta\' # set at 78 plus 1 space

# center all text in the middle of 79-column width. In method 1,
# spaces at the beginning of the line are significant, and trailing
# spaces are appended at the end of the line. In method 2, spaces at
# the beginning of the line are discarded in centering the line, and
# no trailing spaces appear at the end of lines.
sed -e :a -e \'s/^.\\{1,77\\}$/ & /;ta\' # method 1
sed -e :a -e \'s/^.\\{1,77\\}$/ &/;ta\' -e \'s/\\( *\\)\\1/\\1/\' # method 2

# substitute (find and replace) \"foo\" with \"bar\" on each line
sed \'s/foo/bar/\' # replaces only 1st instance in a line
sed \'s/foo/bar/4\' # replaces only 4th instance in a line
sed \'s/foo/bar/g\' # replaces ALL instances in a line
sed \'s/\\(.*\\)foo\\(.*foo\\)/\\1bar\\2/\' # replace the next-to-last case
sed \'s/\\(.*\\)foo/\\1bar/\' # replace only the last case

# substitute \"foo\" with \"bar\" ONLY for lines which contain \"baz\"
sed \'/baz/s/foo/bar/g\'

# substitute \"foo\" with \"bar\" EXCEPT for lines which contain \"baz\"
sed \'/baz/!s/foo/bar/g\'

# change \"scarlet\" or \"ruby\" or \"puce\" to \"red\"
sed \'s/scarlet/red/g;s/ruby/red/g;s/puce/red/g\' # most seds
gsed \'s/scarlet\\|ruby\\|puce/red/g\' # GNU sed only

# reverse order of lines (emulates \"tac\")
# bug/feature in HHsed v1.5 causes blank lines to be deleted
sed \'1!G;h;$!d\' # method 1
sed -n \'1!G;h;$p\' # method 2

# reverse each character on the line (emulates \"rev\")
sed \'/\\n/!G;s/\\(.\\)\\(.*\\n\\)/&\\2\\1/;//D;s/.//\'

# join pairs of lines side-by-side (like \"paste\")
sed \'$!N;s/\\n/ /\'

# if a line ends with a backslash, append the next line to it
sed -e :a -e \'/\\\\$/N; s/\\\\\\n//; ta\'

# if a line begins with an equal sign, append it to the previous line
# and replace the \"=\" with a single space
sed -e :a -e \'$!N;s/\\n=/ /;ta\' -e \'P;D\'

# add commas to numeric strings, changing \"1234567\" to \"1,234,567\"
gsed \':a;s/\\B[0-9]\\{3\\}\\>/,&/;ta\' # GNU sed
sed -e :a -e \'s/\\(.*[0-9]\\)\\([0-9]\\{3\\}\\)/\\1,\\2/;ta\' # other seds

# add commas to numbers with decimal points and minus signs (GNU sed)
gsed \':a;s/\\(^\\|[^0-9.]\\)\\([0-9]\\+\\)\\([0-9]\\{3\\}\\)/\\1\\2,\\3/g;ta\'