To execute a command, put it in $( ). You can embed this inside "" quotes like a variable.
i.e.
Code:
echo "$(date +%Y-%m-%d-%H-%M-%S) server down"
I recomend YYYY-MM-DD-HH-MM-SS dates at the beginning of log lines, because they sort and compare so nicely. You'll be able to check if a line is >= "2014-10-10-12-00-00" just with ordinary alphanumeric comparison, etc.
Dear friends,
please tell me how to find the files which are existing in the current directory, but it sholud not search in the sub directories..
it is like this,
current directory contains
file1, file2, file3, dir1, dir2
and dir1 conatins
file4, file5
and dir2 contains
file6,... (9 Replies)
Hey all,
I have a shell that invokes a AWK.
In this AWK i want invoke a function that receives 3 parameters:
date: 20080831
time: 235901
duration: 00023
that function receive this 3 parameters and sum to this value two more seconds:
2008083123590100025
Remember that in case that... (3 Replies)
After configuring NIS client & server when I restart my system there is a message "YPBINDPROC_DOMAIN: Domain not bound" which falls in infinite loop, although I stopped ypbind service. Please help me in this regard as I have to install all from start. (1 Reply)
AIX 4.2
I am trying to do an rsh grep to search for date records inside server logs by doing this :
xx=`date +"%a %b %d"`
rsh xxx grep "^$XX" zzz
gives :
grep: 0652-033 Cannot open Jun.
grep: 0652-033 Cannot open 11.
But if I do :
xx=`date +"%a %b %d"`
grep "^$XX" zzz
it works... (2 Replies)
Hi,
I have line in input file as below:
3G_CENTRAL;INDONESIA_(M)_TELKOMSEL;SPECIAL_WORLD_GRP_7_FA_2_TELKOMSEL
My expected output for line in the file must be :
"1-Radon1-cMOC_deg"|"LDIndex"|"3G_CENTRAL|INDONESIA_(M)_TELKOMSEL"|LAST|"SPECIAL_WORLD_GRP_7_FA_2_TELKOMSEL"
Can someone... (7 Replies)
If I enter (simplified):
find . -printf "%p\n"
then all files in the output are prepended by a "." like
./local/share/test23.log
How can achieve that
a.) the leading "./" is omitted
and/or
b.) the full path to the current directory is inserted (enclosed by brackets and a blank)... (1 Reply)
Hello experts!
I need your help please
I have a file.txt of which I want to extract 3rd and 4th columns with date with the form e.g.:
2016-11-25 03:14:50and pass them to "date" command, but also append the 9th column in a file as well.
So I want to execute
date -d '2016-11-25 03:14:50' ... (2 Replies)
Hello, there!
I am trying to pass an awk variable into a shell command in order to collect the result into an awk variable; in Bash it does work, as in:
v='2'; date -d "now + $v weeks"
But in awk it does not, as in:
v="2"
"date -d 'now + v weeks'" | getline newdate
close ("date -d 'now... (3 Replies)
Discussion started by: fbird3
3 Replies
LEARN ABOUT CENTOS
while
while(n) Tcl Built-In Commands while(n)
__________________________________________________________________________________________________________________________________________________NAME
while - Execute script repeatedly as long as a condition is met
SYNOPSIS
while test body
_________________________________________________________________DESCRIPTION
The while command evaluates test as an expression (in the same way that expr evaluates its argument). The value of the expression must a
proper boolean value; if it is a true value then body is executed by passing it to the Tcl interpreter. Once body has been executed then
test is evaluated again, and the process repeats until eventually test evaluates to a false boolean value. Continue commands may be exe-
cuted inside body to terminate the current iteration of the loop, and break commands may be executed inside body to cause immediate termi-
nation of the while command. The while command always returns an empty string.
Note: test should almost always be enclosed in braces. If not, variable substitutions will be made before the while command starts execut-
ing, which means that variable changes made by the loop body will not be considered in the expression. This is likely to result in an
infinite loop. If test is enclosed in braces, variable substitutions are delayed until the expression is evaluated (before each loop iter-
ation), so changes in the variables will be visible. For an example, try the following script with and without the braces around $x<10:
set x 0
while {$x<10} {
puts "x is $x"
incr x
}
EXAMPLE
Read lines from a channel until we get to the end of the stream, and print them out with a line-number prepended:
set lineCount 0
while {[gets $chan line] >= 0} {
puts "[incr lineCount]: $line"
}
SEE ALSO
break(n), continue(n), for(n), foreach(n)
KEYWORDS
boolean value, loop, test, while
Tcl while(n)