Your read command is backwards -
IFS sets the record separator for a read, by default it is space(s). This means the first text block gets put in a, second in b, third in the c variable.
You can also create arrays like that:
bash uses declare -a arrayname value1 value2 ... valuen
plus you can assign values directly to each element of an array.
This User Gave Thanks to jim mcnamara For This Post:
Actually I want to display the entire output fired by ps command. My output gets trucated after 80 chars.
Thus, i am not able to see the entire command running when i give a ps -eaf ....
Does anyone know how do i display the entire output fired by ps command .. (i.e the command along with... (5 Replies)
I know there are caveats about using read in pipelines because read is treated by a subshell. I know this but I can't think of any way to accomplish this regardless, I'm still a rookie.
I hope somebody will be able to interpret what it is that I'm trying to accomplish and correct me.
... (2 Replies)
Hello All,
I have a an application written in C and runing on Red Hat Linux.
In my code I have written a command that is fired on the linux shell by using system() function call.
Now I need to read the output of this command in my c program and assign it to a variable.
Can anyone... (1 Reply)
I know this script is crummy, but I was just messing around.. how do I get sed's insert command to allow variable expansion to show the filename?
#!/bin/bash
filename=`echo $0`
/usr/bin/sed '/#include/ {
i\
the filename is `$filename`
}' $1
exit 0 (8 Replies)
Hi All,
How I will read the output of the tail -F command in perl.
I have text file with below contains
file1.txt
1
2
3
4
$running=1;
sub openLog($)
{
(my $log) = @_; (1 Reply)
Hi. I'm trying to write a script that reads a line on a file and runs a different command for a different line output.
For example, if it finds the word "Kuku" on the line it sends mail to Kuku@kuku.com. Otherwise, it sends mail to Lulu@lulu.com.
TIA. (2 Replies)
I'm working on a short BASH script on my Ubuntu box that will run powerpoint scripts with MS Powerpoint Viewer 2007 via WINE.
I can run the presentation when I run it manually but what i'd like to do is have the script look for the newest file then run it.
#! /bin/sh
# Start the newest... (2 Replies)
Okay, so I have a file containing line after line of three digit numbers. I need a script that does an action based on the last two numbers in this list.
So.... To get the last two numbers, I can have the script do
tail -2 filename.txt
But where I run into trouble is as follows. If... (6 Replies)
Hi!
I have run the following command: snoop -q -d e1000g0 -o /var/tmp/optima0.txt & them I am trying to read the output of it with snoop -i /var/tmp/optima0.txt, which is giving me this: # snoop -i /var/tmp/optima0.txt | more
1 0.00000 AIOPTSVR -> 10.100.4.72 TCP D=1393 S=22 Push... (8 Replies)
Hi Folks,
I'm currently trying to read several values into different variables.
Actually, what I'm doing works, but I get an error message.
My attempts are:
read strCPROC strIPROC strAPROC <<<$(ssh -n -T hscroot@$HMC "lshwres -r proc -m $strIDENT --level sys -F \"configurable_sys_proc_units... (11 Replies)
Discussion started by: NKaede
11 Replies
LEARN ABOUT SUSE
subst
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)