09-17-2008
Need help with file substitution
hello all
just trying to write a script that will read a file (line by line) and substitute (tht line) in a different file if (tht line) is present in second file
Ex: script has to read file A (line by line) and if file B has tht line it should get substituted with the line in file A
file A:
length=30
threads=40
file B:
threads=20
The script has to read file A (line by line) and has to substitute file B in this case threads=20 with threads=40. Please let me know if guys have any ideas.
10 More Discussions You Might Find Interesting
1. Solaris
Hi,
I have two files. Want to make an addition of the fifth column of from both the files and redirect it to a third file.
Both files have same records except fifth field and same record should be inserted into new file having fifth field as addition of fifth fields of both files.
for... (2 Replies)
Discussion started by: sanjay1979
2 Replies
2. Shell Programming and Scripting
Hey, I was trying to figure out how to launch a program from the command line, and it works if you pass it a config file. I was thinking about writing a script to dynamically create the config file and pass it to the command using something like command substitution (so I don't actually have to... (3 Replies)
Discussion started by: bj0
3 Replies
3. Shell Programming and Scripting
1) ABC::2197.12:2197.12:120217144365::+DEF:INT:1:N::::6:550.00:0.00:2009-04-29:CN:4547425069636596::6:N:mrs charles:N:PH:00010031:0001'
OUTPUT - ABC::2197.12:2197.12:120217144365::+DEF:INT:1:N::::6:550.00:0.00:2009-04-29:CN:4547******636596::6:N:mrs charles:N:PH:00010031:0001'
The... (5 Replies)
Discussion started by: mad_man12
5 Replies
4. Solaris
Hi,
I have to read a file and translate the contents including substituting the variables if any and write to another file without using sed or awk.
For ex:-
inputfile.txt
-----------
servername=$SERVER
application=$APPL
outputfile.txt
------------
servername=actual server name... (2 Replies)
Discussion started by: axes
2 Replies
5. Shell Programming and Scripting
Hi, i want to change a subs. value in a file, with using a script..
this is my script... (example)
#!/bin/bash
NDIR=`zenity --file-selection --directory`
mv $HOME/Desktop/myfile /tmp/myfile.temp
XT='"'
perl -pe "s/.*/DIR=$XT`echo -e "$NDIR"`$XT/ if $. == 40" <... (2 Replies)
Discussion started by: excsra
2 Replies
6. Shell Programming and Scripting
hi, sorry if this seems trivial.
i have a file url.txt which consists of a list of urls (it was supposed to be my wget -i file). however, since the server from which i am trying to download uses redirect, wget dows not remeber the filename of ther original url will save to a file name which is... (3 Replies)
Discussion started by: texttoolong
3 Replies
7. Shell Programming and Scripting
MyFile contains:
ALTER TABLE $DBN.$TBN
ADD $COL $TYP COMPRESS ($VAL);
I need to cat the file and have it substitute all of the variables with their contents. cat MyFile does not work. The following works for the first line, but errors on the second line because of the paren:
$ while read... (2 Replies)
Discussion started by: Phil27577
2 Replies
8. Shell Programming and Scripting
Hi,
I have file1 like this:
a 64
b 66
c 67and file2 like this:
@1234
1123
aabbcc
@5453
5543
ccbaI want to replace each letter of the third line in file2 with corresponding number in file1. So desired output is,
@1234
1123
646466666767
@5453
5543
67676664I tried something like... (4 Replies)
Discussion started by: polsum
4 Replies
9. Shell Programming and Scripting
I have a huge script which is defining variables with full path of commands in the beginning of code and using those variables in the script.
For Example:
ECHO=/bin/echo
LS=/bin/ls
SED=/bin/sed
AWK=/bin/awk
UNAME=/bin/uname
PS=/bin/ps
DATE=/bin/date
GREP=/bin/grep
$ECHO "hello... (1 Reply)
Discussion started by: veeresh_15
1 Replies
10. Shell Programming and Scripting
Hi,
I have a script in which the file name is always known, but the extension could vary. I want to be able to use a single variable; no if-else statements. For example, if I have config.txt in the directory then that's what I want to use, but if config.xml is in the directory then use that. The... (9 Replies)
Discussion started by: ocbit
9 Replies
subst(n) Tcl Built-In Commands subst(n)
__________________________________________________________________________________________________________________________________________________
NAME
subst - Perform backslash, command, and variable substitutions
SYNOPSIS
subst ?-nobackslashes? ?-nocommands? ?-novariables? string
_________________________________________________________________
DESCRIPTION
This command performs variable substitutions, command substitutions, and backslash substitutions on its string argument and returns the
fully-substituted result. The substitutions are performed in exactly the same way as for Tcl commands. As a result, the string argument
is actually substituted twice, once by the Tcl parser in the usual fashion for Tcl commands, and again by the subst command.
If any of the -nobackslashes, -nocommands, or -novariables are specified, then the corresponding substitutions are not performed. For
example, if -nocommands is specified, command substitution is not performed: open and close brackets are treated as ordinary characters
with no special interpretation.
Note that the substitution of one kind can include substitution of other kinds. For example, even when the -novariables option is speci-
fied, command substitution is performed without restriction. This means that any variable substitution necessary to complete the command
substitution will still take place. Likewise, any command substitution necessary to complete a variable substitution will take place, even
when -nocommands is specified. See the EXAMPLES below.
If an error occurs during substitution, then subst will return that error. If a break exception occurs during command or variable substi-
tution, the result of the whole substitution will be the string (as substituted) up to the start of the substitution that raised the excep-
tion. If a continue exception occurs during the evaluation of a command or variable substitution, an empty string will be substituted for
that entire command or variable substitution (as long as it is well-formed Tcl.) If a return exception occurs, or any other return code is
returned during command or variable substitution, then the returned value is substituted for that substitution. See the EXAMPLES below.
In this way, all exceptional return codes are "caught" by subst. The subst command itself will either return an error, or will complete
successfully.
EXAMPLES
When it performs its substitutions, subst does not give any special treatment to double quotes or curly braces (except within command sub-
stitutions) so the script
set a 44
subst {xyz {$a}}
returns "xyz {44}", not "xyz {$a}" and the script
set a "p} q {r"
subst {xyz {$a}}
returns "xyz {p} q {r}", not "xyz {p} q {r}".
When command substitution is performed, it includes any variable substitution necessary to evaluate the script.
set a 44
subst -novariables {$a [format $a]}
returns "$a 44", not "$a $a". Similarly, when variable substitution is performed, it includes any command substitution necessary to
retrieve the value of the variable.
proc b {} {return c}
array set a {c c [b] tricky}
subst -nocommands {[b] $a([b])}
returns "[b] c", not "[b] tricky".
The continue and break exceptions allow command substitutions to prevent substitution of the rest of the command substitution and the rest
of string respectively, giving script authors more options when processing text using subst. For example, the script
subst {abc,[break],def}
returns "abc,", not "abc,,def" and the script
subst {abc,[continue;expr {1+2}],def}
returns "abc,,def", not "abc,3,def".
Other exceptional return codes substitute the returned value
subst {abc,[return foo;expr {1+2}],def}
returns "abc,foo,def", not "abc,3,def" and
subst {abc,[return -code 10 foo;expr {1+2}],def}
also returns "abc,foo,def", not "abc,3,def".
SEE ALSO
Tcl(n), eval(n), break(n), continue(n)
KEYWORDS
backslash substitution, command substitution, variable substitution
Tcl 7.4 subst(n)