if the "$ " is passing itself then what is the use of it ?
Traditionally, the command line prompt under Bourne shell and compatible ones has been $ for regular users and # for root. You are free to modify this prompt and it is stored in the PS1 variable. The command documented in your book is just prepending the machine hostname to this default prompt.
The hostname is either taken from the HOST variable if set, or get from the uname -n command which returns the nodename, it is generally equivalent to the hostname one.
Quote:
i think i using some useless book .
A typo doesn't make a book useless.
---------- Post updated at 13:37 ---------- Previous update was at 13:33 ----------
Quote:
Originally Posted by PikK45
Yes, that is how the script works.
Code:
HOST:=`uname -n`
The result of uname -n is being stored in HOST variable.
A correct syntax would be:
Code:
: ${HOST:=`uname -n`}
In any case, the result of uname -n is stored in the HOST variable only if the latter is unset, otherwise, HOST keeps its previous value.
I have this code
#!/bin/bash
LZ () {
RETVAL="\n$(date +%Y-%m-%d_%H-%M-%S) --- "
return RETVAL
}
echo -e $LZ"Test"
sleep 3
echo -e $LZ"Test"
which I want to use to make logentrys on my NAS. I expect of this code that there would be output like
2017-03-07_11-00-00 --- Test (4 Replies)
Hi
i was going through the script debugging technique. below example was given in the book.
1 #!/bin/sh
2
3 Failed() {
4 if ; then
5 echo "Failed. Exiting." ; exit 1 ;
6 fi
7 echo "Done."
8 }
9
10 echo "Deleting old backups,... (11 Replies)
Hi all,
I'm not clear of this regexp command:
regexp {(\S+)\/+$} $String match GetString
From my observation and testing,
if $String is abc/def/gh
$GetString will be abc/def
I don't understand how the /gh in $String got eliminated.
Please help. Thanks (2 Replies)
If I don't explain my issue well enough, I apologize ahead of time, extreme newbie here to scripting.
I'm currently learning scripting from books and have moved on to the text Wicked Cool Shell Scripts by Dave Taylor, but there are still basic concepts that I'm having trouble understanding.
... (10 Replies)
Hello,
I've inherited an NFS setup that allows external servers to write to an NFS share on a Centos box. Here is an example line from /etc/exports (there are four entries that only are different based on server IP adress).
/exports/foobar... (4 Replies)
hello all,
I know this is a silly question but i have no answer.
I have a shell script temp.ksh
export value="mynh"
echo $value
but when i execute the temp.ksh "mynh" is printed but
when i give echo $value in the shell after the program is executed, nothing is printed.
... (3 Replies)
Hi, I am facing a problem while scheduling an export of a table using cron job. I have written a simple export command inside a shell script test.sh like
echo started
exp schemaname/temp1234 file= /test/d.dmp tables=per_st log= /test/d.log
echo ended
I tried scheduling it through... (6 Replies)
Hi,
Can anyone please let me know the meaning of this line,i am not able to understand the egrep part(egrep '^{1,2}).This will search for this combination in beginning but what does the values in {}signifies here.
/bin/echo $WhenToRun | egrep '^{1,2}:$' >/dev/null (1 Reply)
hi, :)
I created a main script called "Paymain.prg" ( /proj/paymain.prg)
In this script i created two variables as follows
MASTER=/HOME/emaster.dbf
TRAN=/HOME/etran.dbf
Aftre that i exported that two variables
EXPORT MASTER TRAN
But when i use these two variable in another script calld... (3 Replies)
Me dumb. Can't get this to work...
#!/bin/sh
export JAVA_HOME_BAK=${JAVA_HOME}
or
#!/bin/sh
export JAVA_HOME_BAK=/usr/java
or
#!/bin/sh
export JAVA_HOME_BAK=$JAVA_HOME
or
#!/bin/sh
export JAVA_HOME_BAK $JAVA_HOME
etc.... none work.
Either i get: "JAVA_HOME_BAK=/usr/java: is not... (1 Reply)
07-11-2012
