09-28-2007
how to remove specific lines from a file
When restoring a file in my uninstall program I need to remove the lines I added to a file during the install. In between the file can be modified by the users.
Assume file1 is as follow:
xxx str2 xxxx
.....
...The Following lines containing str* have to be removed...
xxx str1 xxxx
xxx str2 xxxxx
xxxx aaa, xxx
xxxxx str4 xxx
Result:
xxx str2 xxxx
.....
xxxx aaa, xxx
I know how to remove the line "The Following lines containing str* ...":
ln=`grep -n 'The Following lines containing' | cut -d',' -f 1`
sed $lnd file1
I also know how to remove the lines with str* in it with awk:
awk 'BEGIN { FS=";" } { if ( $2 ~ /str*/ ) { print $0 } }' file1 > outputF
However, how to do this without removing the lines with str* before the line "The Following lines containing str* have to be removed" ? (the first line in file1 for example).
Any help would be greatly appreciated!!
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LEARN ABOUT DEBIAN
combine
COMBINE(1) COMBINE(1)
NAME
combine - combine sets of lines from two files using boolean operations
SYNOPSIS
combine file1 and file2
combine file1 not file2
combine file1 or file2
combine file1 xor file2
_ file1 and file2 _
_ file1 not file2 _
_ file1 or file2 _
_ file1 xor file2 _
DESCRIPTION
combine combines the lines in two files. Depending on the boolean operation specified, the contents will be combined in different ways:
and Outputs lines that are in file1 if they are also present in file2.
not Outputs lines that are in file1 but not in file2.
or Outputs lines that are in file1 or file2.
xor Outputs lines that are in either file1 or file2, but not in both files.
"-" can be specified for either file to read stdin for that file.
The input files need not be sorted, and the lines are output in the order they occur in file1 (followed by the order they occur in file2
for the two "or" operations). Bear in mind that this means that the operations are not commutative; "a and b" will not necessarily be the
same as "b and a". To obtain commutative behavior sort and uniq the result.
Note that this program can be installed as "_" to allow for the syntactic sugar shown in the latter half of the synopsis (similar to the
test/[ command). It is not currently installed as "_" by default, but you can alias it to that if you like.
SEE ALSO
join(1)
AUTHOR
Copyright 2006 by Joey Hess <joey@kitenet.net>
Licensed under the GNU GPL.
moreutils 2012-04-09 COMBINE(1)