I am trying below command to be passed in a shell script, header_date_14 is a variable and $1 is the name of a file I intend to pass as a command line argument, however command line argument is not being accepted.
You should never NEVER use constructs like $1 directly in your code. You see, $1, $2, etc. are positional parameters, not variables. $1 isn't the name of a variable just happening to have the name "1", like "$foo", it is the first parameter passed to this specific context - and what "this specific context" means can change (and does so) from context to context.
Therefore instead of doing:
do it like this:
This also gives you the opportunity to give a meaningful name to the variable like "inputfile", instead of "$1", which won't tell you by its name what it is supposed to contain.
Hi
I am trying to write a function that needs to be able to assign the last run shell command to a variable. The actual command string itself not the exit code of the command.
I am using the bash command recall ability to do this as follows:
alias pb='ps | grep ash' ... (3 Replies)
Hi,
I am new to UNIX Scripting. I have been trying to use the CUT command to retrieve part of the header from a file and assign it to a variable. I have tried searching a lot, but I am still unsuccessful.
Sample Header: HJAN BALANCE 20090616
I need to retrieve the date here, which always... (10 Replies)
Hi ,
I would like to assign command (with pipe) output to a variable. The code is as follows. The goal of the code is to get the last folder folder with a particular name pattern.
myDate=`ls | grep 2009 | tail -1`
echo "myDate=" $myDate
However, in the presence of the pipe, the code... (3 Replies)
Dear All,
we have a command output which looks like :
Total 200 queues in 30000 Kbytes
and we're going to get "200" and "30000" for further process. currently, i'm using :
numA=echo $OUTPUT | awk '{print $2}'
numB=echo $OUTPUT | awk '{print $5}'
my question is : can I use just one... (4 Replies)
Hi all,
Hereby wish to have your advise for below:
Main concept is
I intend to get current directory of my script file.
This script file will be copied to /etc/init.d.
A string in this copy will be replaced with current directory value.
Below is original script file:
... (6 Replies)
Code
set -x
STATUS="0"
echo $STATUS
for i in `ls -ltr Report*|awk '{ print $9 }'`
do
if
then
flg = "`head -1 "$i" |cut -c 31-33`"
echo `head -1 "$i" |cut -c 31-33`
echo $flg
if
then
echo "having Fun"
STATUS="2"
else
echo "no Fun"
fi
fi (2 Replies)
Hi,
I have the following command that lists all the .o files from all the directories except of vwin (which I don't want it)
for i in `ls -d */*.o|awk '$0 !~ "vwin"'`; do echo $i; done
The result is something like that
dir1/file1.o
dir1/file2.o
dir2/file3.o
etc.
So, I want to create a... (9 Replies)
I have the following script, and I want to assign the output ($10 and $5) from awk to N and L:
grdinfo data.grd | awk '{print $10,$5}'| read N L
output from gridinfo data.grd is: data.grd 50 100 41 82 -2796 6944 0.016 0.016 3001 2461. where N and L is suppose to be 3001 and 100. I use... (8 Replies)
Hi,
I have the script below. When i assign SSH_COMMAND to "ssh -o ConnectTimeout=2 ${SERVER} ${AS_SUDO} ${COMMANDS}" and then execute it as ${SSH_COMMAND} I get the following error:
ssh: Could not resolve hostname sudo: Name or service not known
ssh: Could not resolve hostname sudo: Name or... (3 Replies)
Discussion started by: mohca2020
3 Replies
LEARN ABOUT REDHAT
code
code(n) [incr Tcl] code(n)
NAME
code - capture the namespace context for a code fragment
SYNOPSIS
code ?-namespace name? command ?arg arg ...?
DESCRIPTION
Creates a scoped value for the specified command and its associated arg arguments. A scoped value is a list with three elements: the
"@scope" keyword, a namespace context, and a value string. For example, the command namespace foo {
code puts "Hello World!" } produces the scoped value: @scope ::foo {puts {Hello World!}} Note that the code command captures the cur-
rent namespace context. If the -namespace flag is specified, then the current context is ignored, and the name string is used as the
namespace context.
Extensions like Tk execute ordinary code fragments in the global namespace. A scoped value captures a code fragment together with its
namespace context in a way that allows it to be executed properly later. It is needed, for example, to wrap up code fragments when a Tk
widget is used within a namespace: namespace foo {
private proc report {mesg} {
puts "click: $mesg"
}
button .b1 -text "Push Me" -command [code report "Hello World!"]
pack .b1 } The code fragment associated with button .b1 only makes sense in the context of namespace "foo". Furthermore, the "report"
procedure is private, and can only be accessed within that namespace. The code command wraps up the code fragment in a way that allows it
to be executed properly when the button is pressed.
Also, note that the code command preserves the integrity of arguments on the command line. This makes it a natural replacement for the
list command, which is often used to format Tcl code fragments. In other words, instead of using the list command like this: after 1000
[list puts "Hello $name!"] use the code command like this: after 1000 [code puts "Hello $name!"] This not only formats the command cor-
rectly, but also captures its namespace context.
Scoped commands can be invoked like ordinary code fragments, with or without the eval command. For example, the following statements work
properly: set cmd {@scope ::foo .b1} $cmd configure -background red
set opts {-bg blue -fg white} eval $cmd configure $opts Note that scoped commands by-pass the usual protection mechanisms; the command:
@scope ::foo {report {Hello World!}} can be used to access the "foo::report" proc from any namespace context, even though it is private.
KEYWORDS
scope, callback, namespace, public, protected, private
itcl 3.0 code(n)