Greetings.
I am struggling with a shell script to make my life simpler, with a number of practical ways in which it could be used. I want to take a standard text file, and pull the 'n'th word from each line such as the first word from a text file.
I'm struggling to see how each line can be... (5 Replies)
Hi All,
I have a file like this,
data1,data2,,,data5,data6.
i want to write a shell script to replace data3 with "/example/string". which means my data file should look like this .
data1,data2,example/string],,data5,data6.
Could you guys help me to get a sed command or any other command... (8 Replies)
hello mighty all
there is a line of 50 words and i need to take a random number of words from the beginning (20 words for example) then put my word then add other 10 words from the continue then add another my special word then add 20 words till the end..
my own knowledge base can say it is... (12 Replies)
Hi,
I am new to shell scripting. I need a bash shell scripts which search and grep a parameter value from input.txt file and insert it in between two semicolon of second line of output.txt file.
For example
The shell script search an IP address as parameter value from input.txt ... (2 Replies)
Hello,
I am looking to automate a task - which is updating an existing access control instruction of a server and making sure that the attributes defined in the instruction is in sorted order. The instructions will be of a specific syntax.
For example lets assume below listed is one of an... (6 Replies)
Hi,
I have a text file with one line having few words separated by space and I need to insert another word on "n"th column/field so that previous word should shift right (to n+1st column). how can I do that?
It seems we can do using awk but unable to figure out.
Please advise, thanks!
... (11 Replies)
Hi All,
Hope you guys had a wonderful weekend
I have a scenario where in which I have to read a file line by line
and check for few words before redirecting to a file
I have searched the forum but,either those answers dint work (perhaps because of my wrong under standing of how IFS... (6 Replies)
I have a file: file.txt, which contains the following data in it.
This is a file, my name is Karl, what is this process, karl is karl junior, file is a test file, file's name is file.txt
My name is not Karl, my name is Karl Joey
What is your name?
Do you know your name and... (3 Replies)
I have a test file that I want to read and insert only certain lines into the
the table based on a filter.
1. Rread the log file 12 Hours back Getdate() -12 Hours
2. Extract the following information on for lines that say "DUMP is
complete"
A. Date
B. Database Name
C.... (2 Replies)
Hi All,
I am using UNix Sun OS sun4u sparc SUNW,SPARC-Enterprise
My intention is to insert a line of text after 13th line of every file inside a particular directory.
While trying to do it for a single file , i am using sed
sed '3 i this is the 4th line' filename
sed: command garbled: 3... (5 Replies)
Discussion started by: gotamp
5 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)