12-21-2010
Sorry, I should have been more clear.
I know the $ indicates that it is a scalar variable but i have never seen $ by itself on a line.
I know that $opt_c is a variable and i know what $_ does but what does $ do by itself on it's own line.
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
I had posted previously about this problem I had.
I have multiple text files with hundreds of lines of the following type:
2000001 34 54 234 2000001
32 545 2000001 -2000001 77 2000001 44 2000001 998 2000001
77 32 2000001 45 23 111 89
98 75 23 34 999
.
.
.
etc...
What I wanted was... (2 Replies)
Discussion started by: xchen89x
2 Replies
2. UNIX for Dummies Questions & Answers
i'm confused what this means.
i was asked to design a menu or command line option driven script that reads out of a DB and displays info such as
read_data.pl -u <user> -e <event>
which would print commands run by <user>with the <event> in the db.
any suggestions? i've been using... (2 Replies)
Discussion started by: kpddong
2 Replies
3. Shell Programming and Scripting
so in unix this command works works and shows me a list of directories
find . -name \*.xls -exec dirname {} \; | sort -u | > list.txt
but when i try running a perl script to run this command
my $query = 'find . -name \*.xls -exec dirname {} \; | sort -u | > list.txt';... (2 Replies)
Discussion started by: kpddong
2 Replies
4. Shell Programming and Scripting
so i have 3 options - i, d, a - for id, date, and arguments
therefore
perl test.pl -i admin -d 11/1/1
would show me the results of a table with the id admin on the date of 11/1/1.
i would like
perl test.pl -i admin -d 11/1/1 -a
to show me results of a table with the id, admin on the... (0 Replies)
Discussion started by: kpddong
0 Replies
5. Shell Programming and Scripting
Hello everyone,
I have a perl script which takes various command line options from user like :
test.pl -i <input_file> -o <output_file> -d <value> -c <value>
Now I have multiple input files in a directory:
<input_file_1>
<input_file_2>
<input_file_3>
<input_file_4>
.....
....
...... (6 Replies)
Discussion started by: ad23
6 Replies
6. Shell Programming and Scripting
i am a beginner, i want to make a program that takes any command line arguments... and print it out in reverse.
ie. if the command line argument is "thanks for helping me"
i want it to output "me helping for thanks" :D
i have tried using the reverse command, but i cant get it working!!
... (3 Replies)
Discussion started by: bshell_1214
3 Replies
7. UNIX for Dummies Questions & Answers
Hi All,
I am trying to execute the following tar command with two --exclude options to suppress extract of the two directories specified.
Do I need to single quote the directory paths ??
Many thanks for your help.
The relevant code excerpt from the script is:
cd /var/www/${SITE}
... (7 Replies)
Discussion started by: daveu7
7 Replies
8. UNIX for Dummies Questions & Answers
Hi all!
I have a data set in this tab separated format : Label, Value1, Value2
An instance is "data.txt" :
0 1 1
-1 2 3
0 2 2
I would like to parse this data set and generate two files, one that has only data with the label 0 and the other with label -1, so my outputs should be, for... (1 Reply)
Discussion started by: gnat01
1 Replies
9. Shell Programming and Scripting
Hi All,
I have written a menu driven bash shell script.
Current Output is as below:
-------------------------------------
Main Menu
-------------------------------------
Option 1
Option 2
Option 3
Option 4
Exit
=====================================
Enter your... (3 Replies)
Discussion started by: kiran_j
3 Replies
10. Shell Programming and Scripting
I am looking for help in processing of those options: '-n' or '-p'
I understand what they do and how to use them.
But, I would like to use them with more than one file (and without any shell-loop; loading the 'perl' once.)
I did try it and -n works on 2 files.
Question is:
- is it possible to... (6 Replies)
Discussion started by: alex_5161
6 Replies
LEARN ABOUT CENTOS
tcl_upvar
Tcl_UpVar(3) Tcl Library Procedures Tcl_UpVar(3)
__________________________________________________________________________________________________________________________________________________
NAME
Tcl_UpVar, Tcl_UpVar2 - link one variable to another
SYNOPSIS
#include <tcl.h>
int
Tcl_UpVar(interp, frameName, sourceName, destName, flags)
int
Tcl_UpVar2(interp, frameName, name1, name2, destName, flags)
ARGUMENTS
Tcl_Interp *interp (in) Interpreter containing variables; also used for error reporting.
const char *frameName (in) Identifies the stack frame containing source variable. May have any of the forms accepted by the
upvar command, such as #0 or 1.
const char *sourceName (in) Name of source variable, in the frame given by frameName. May refer to a scalar variable or to an
array variable with a parenthesized index.
const char *destName (in) Name of destination variable, which is to be linked to source variable so that references to destName
refer to the other variable. Must not currently exist except as an upvar-ed variable.
int flags (in) One of TCL_GLOBAL_ONLY, TCL_NAMESPACE_ONLY or 0; if non-zero, then destName is a global or namespace
variable; otherwise it is local to the current procedure (or current namespace if no procedure is
active).
const char *name1 (in) First part of source variable's name (scalar name, or name of array without array index).
const char *name2 (in) If source variable is an element of an array, gives the index of the element. For scalar source vari-
ables, is NULL.
_________________________________________________________________
DESCRIPTION
Tcl_UpVar and Tcl_UpVar2 provide the same functionality as the upvar command: they make a link from a source variable to a destination
variable, so that references to the destination are passed transparently through to the source. The name of the source variable may be
specified either as a single string such as xyx or a(24) (by calling Tcl_UpVar) or in two parts where the array name has been separated
from the element name (by calling Tcl_UpVar2). The destination variable name is specified in a single string; it may not be an array ele-
ment.
Both procedures return either TCL_OK or TCL_ERROR, and they leave an error message in the interpreter's result if an error occurs.
As with the upvar command, the source variable need not exist; if it does exist, unsetting it later does not destroy the link. The desti-
nation variable may exist at the time of the call, but if so it must exist as a linked variable.
KEYWORDS
linked variable, upvar, variable
Tcl 7.4 Tcl_UpVar(3)