$cat /tmp/foo
#Hello this is 1st line
my.toggle.enabled=true
#Hello this the 2nd line
my.other.toggle.enabled=true
I have a sed command to replace the value to true or false like this using sed.
Code:
sed -i '/my.toggle.enabled=true/c\\my.toggle.enabled=false' /tmp/foo
This replaces the line, I am good. But this wont avoid the risk of duplicate entries. Suppose if somebody adds it manually with out noticing that there is already an entry. When I run this sed command it wont clear that mistake. It replaces the line where ever it finds in the file. Is there any way to avoid such risks. I can do it with grep -v. but the problem here is that, the line below the comment is more accurate. I want the new line under the comment.
In simple words, the sed/awk command should remove duplicates and add the new line/value under the comment line.
Write a sed script to extract the year, rank, and stock for the most recent 10 years available in the file top10_mktval.csv, and output in the following format:
------------------------------
YEAR |RANK| STOCK
------------------------------
2007 | 1 | Exxon... (1 Reply)
Hello and thx for reading this
I'm using sed to remove only the leading spaces in a file
bash-280R# cat foofile
some text
some text
some text
some text
some text
bash-280R#
bash-280R# sed 's/^ *//' foofile > foofile.use
bash-280R# cat foofile.use
some text
some text
some text... (6 Replies)
i made a script to update a lot of xml files. to save me some time. Ran it and it replaced all the the files with a 0kb file. The problem i was having is that I am using sed to change xml node <doc_root>. The problem with this is it has a / in the closing xml tag and the stuff inside will also have... (4 Replies)
Hi all,
First off, Thank you all for the knowledge I have gleaned from this site!
Deleting Records from a text file... sed paragraphs
The following code works nearly perfect, however each time it is run on the log file it adds a newline at the head of the file, run it 5 times, it'll have 5... (1 Reply)
I'm not sure if the problem I'm seeing is an artifact of sed or simply a beginner's mistake. Here's the problem: I want to add a zero-width space following each underscore between XML tags. For example, if I had the following xml:
<MY_BIG_TAG>This_is_a_test</MY_BIG_TAG>
It should look like... (8 Replies)
My need is :
Want to change
docBase="/something/something/something"
to
docBase="/only/this/path/for/all/files"
I have some (about 250 files)xml files.
In FileOne it contains
<Context path="/PPP" displayName="PPP" docBase="/home/me/documents" reloadable="true" crossContext="true">... (1 Reply)
Hi,
I am running a script sample.sh in bash environment .In the script i am using sed and awk commands which when executed individually from terminal they are getting executed normally but when i give these sed and awk commands in the script it is giving the below errors :-
./sample.sh: line... (12 Replies)
I am learning SED and just following the shell scripting book, i have trouble understanding the grep and sed statement,
Question : 1
__________
/opt/oracle/work/antony>cat teledir.txt
jai sharma 25853670
chanchal singhvi 9831545629
anil aggarwal 9830263298
shyam saksena 23217847
lalit... (7 Replies)
Discussion started by: Antony Ankrose
7 Replies
LEARN ABOUT DEBIAN
subst
SUBST(1) General Commands Manual SUBST(1)NAME
subst - substitute definitions into file(s)
SYNOPSIS
subst [ -e editor ] -f substitutions victim ...
DESCRIPTION
Subst makes substitutions into files, in a way that is suitable for customizing software to local conditions. Each victim file is altered
according to the contents of the substitutions file.
The substitutions file contains one line per substitution. A line consists of two fields separated by one or more tabs. The first field
is the name of the substitution, the second is the value. Neither should contain the character `#', and use of text-editor metacharacters
like `&' and `' is also unwise; the name in particular is best restricted to be alphanumeric. A line starting with `#' is a comment and
is ignored.
In the victims, each line on which a substitution is to be made (a target line) must be preceded by a prototype line. The prototype line
should be delimited in such a way that it will be taken as a comment by whatever program processes the file later. The prototype line must
contain a ``prototype'' of the target line bracketed by `=()<' and `>()='; everything else on the prototype line is ignored. Subst
extracts the prototype, changes all instances of substitution names bracketed by `@<' and `>@' to their values, and then replaces the tar-
get line with the result.
OPTIONS -e Substitutions are done using the sed(1) editor, which must be found in either the /bin or /usr/bin directories. To specify a dif-
ferent executable, use the ``-e'' flag.
EXAMPLE
If the substitutions file is
FIRST 111
SECOND 222
and the victim file is
x = 2;
/* =()<y = @<FIRST>@ + @<SECOND>@;>()= */
y = 88 + 99;
z = 5;
then ``subst -f substitutions victim'' changes victim to:
x = 2;
/* =()<y = @<FIRST>@ + @<SECOND>@;>()= */
y = 111 + 222;
z = 5;
FILES
victimdir/substtmp.new new version being built
victimdir/substtmp.old old version during renaming
SEE ALSO sed(1)DIAGNOSTICS
Complains and halts if it is unable to create its temporary files or if they already exist.
HISTORY
Written at U of Toronto by Henry Spencer.
Rich $alz added the ``-e'' flag July, 1991.
BUGS
When creating a file to be substed, it's easy to forget to insert a dummy target line after a prototype line; if you forget, subst ends up
deleting whichever line did in fact follow the prototype line.
25 Feb 1990 SUBST(1)