LinuxQuestions.org - [SOLVED] Remove lines with sed

Hmm, I got this, still looking for something more succinct.

Code:

bash-4.1$ sed -e '/[^A-Z][^a-z][^0-9]/d' -e '/:/d; / *#/d; /^ *$/d' /home/glenn/build/scripting/filename1

checking sed to remove lines with symbols 0123456789

 sed G

bash-4.1$

input file, /home/glenn/build/scripting/filename1

Code:

http://sed.sourceforge.net/sed1line.txt

-------------------------------------------------------------------------

USEFUL ONE-LINE SCRIPTS FOR SED (Unix stream editor)        Dec. 29, 2005

Compiled by Eric Pement - pemente[at]northpark[dot]edu        version 5.5



Latest version of this file (in English) is usually at:

  http://sed.sourceforge.net/sed1line.txt

  http://www.pement.org/sed/sed1line.txt



This file will also available in other languages:

  Chinese    - http://sed.sourceforge.net/sed1line_zh-CN.html

  Czech      - http://sed.sourceforge.net/sed1line_cz.html

  Dutch      - http://sed.sourceforge.net/sed1line_nl.html

  French      - http://sed.sourceforge.net/sed1line_fr.html

  German      - http://sed.sourceforge.net/sed1line_de.html

  Italian    - (pending)

  Portuguese  - http://sed.sourceforge.net/sed1line_pt-BR.html

  Spanish    - (pending)



#ref. http://www.ibm.com/developerworks/linux/library/l-sed2.html

#sed script that will remove HTML tags from a file

sed -e 's/<[^>]*>//g' myfile.html

checking sed to remove lines with symbols 0123456789

# Rem blank lines and # comments



# Use following sed magic to remove both comments and empty lines at the same expense:



sed '/ *#/d; /^ *$/d'



#SED processes whatever you give it, and displays it on "STDOUT"---by default, your terminal window. It does not change filenames---that is done with the "mv" command.



#why "ls -d" ?



#I think you need something like this:

for filename in *; do newname= $(sed 's/+//g' $filename); mv $filename $newname; done



To drill down in the directory tree, use "$(ls -R) instead of "*"



sed -e '/[^.][^,][^!][^"][^#][^$][^%][^&][^/][^(][^)][^=][^?][^¡][^¿][^'][^´][^+][^*][^¨][^{][^}][^]][^[][^-][^_][^:][^]][:blank:][:alnum:]/d' /home/glenn/filename1

sed s -e '/[^\.][^\,][^\!][^\"][^\#][^\$][^\%][^\&][^\/][^\(][^\)][^\=][^\?][^\¡][^\¿][^\'][^\´][^\+][^\*][^\¨][^\{][^\}][^\]][^\[][^\-][^\_][^\:][^\]][:blank:][:alnum:]/d' /home/glenn/filename1

sed -e '/[[:blank:]][[:alnum:]]/d' /home/glenn/filename1

cat /home/glenn/filename1 | sed -d '/#\.\*\[\]\\\/\$\^\-\_\?/d'

cat /home/glenn/filename1 | sed -e '/#\*\[\]\\/d'

cat /home/glenn/filename1 | sed -e '/#\.\*\[\]\\\/\$\^\-\_\?/d'







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'



 # insert a blank line above every line which matches "regex"

 sed '/regex/{x;p;x;}'



 # insert a blank line below every line which matches "regex"

 sed '/regex/G'



 # insert a blank line above and below every line which matches "regex"

 sed '/regex/{x;p;x;G;}'



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$//'            # works on ssed, gsed 3.02.80 or higher



 # 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 or higher



 # 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.

 # Can only be done with UnxUtils sed, version 4.0.7 or higher. The

 # UnxUtils version can be identified by the custom "--text" switch

 # which appears when you use the "--help" switch. Otherwise, changing

 # DOS newlines to Unix newlines cannot be done with sed in a DOS

 # environment. Use "tr" instead.

 sed "s/\r//" infile >outfile        # UnxUtils sed v4.0.7 or higher

 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'

Will that do?

@Grail.
On my system that command erased every thing except blank lines.

I'm still learning these tools. Hope this wasn't homework!!!

Regards Glenn