The -F, sets the field separator to a <comma>.
The c[$3] is an array indexed by the contents of field 3. An unintialized variable in awk has value 0 (or empty string) depending on context).
The first time it is evaluated !c[$3] (NOT)(value of c[$3]), is (NOT)zero which evaluates to TRUE. When the value is TRUE the action associated with this awk statement is performed. Since there is no action given, the default action (print the line) is performed.
Then the ++ increments the value of c[$3] so that when this test is performed again on lines with the same 3rd field, the test !c[$3] will evaluate to FALSE because (NOT)(positive integer value) evaluates to zero. When the test evaluates to FALSE, the action associated with this line is not performed so subsequent lines with the same value in the 3rd field are not printed.
This test is performed once for each line in the file in order from beginning to end.
Hi,
I am trying to make a script that creates a list of all active (alive) processes sorted by size and then print this list on screen.
Could anyone help me?
Thaks a lot (7 Replies)
Hi all,
please give me the commands using which i can compare 2 sorted files and get the difference in third file, indiating where the difference is from either file1 or file2.
as:
File1 (Original file)
GARRY
JOHN
JULIE
SAM
---------------
File2
DEV
GARRY
JOHN
JOHNIEE (7 Replies)
Say i have 2 files in the giving format:
file1
1 2 3 4
1 2 3 4
1 2 3 4
file2
1 2 3 4
1 2 3 4
1 2 3 4
I have a PERL code (loaned by one of u -i forgot who - thanks!) that extracts the 2nd column from each file and append horizontally to a new file:
perl -ane 'push @{$L->}, $F; close... (1 Reply)
Hi All,
How can I print the sorted results of the following expression in Perl ??
print "$i\t$h{$i}\n";
I tried
print (sort ("$i\t$h{$i}")"\n"); and other variations of the same but failed.
Can someone suggest how to solve this problem, as I'm tryin print sorted results of my script, which... (11 Replies)
Hi
I have a requirement like below
I need to sort the files based on the timestamp in the file name and run them in sorted order and then archive all the files which are one day old to temp directory
My files looks like this
PGABOLTXML1D_201108121235.xml... (1 Reply)
Hi ,
My requirement is to scan a directory for file names with LTR.PDF*
and send those files via ftp to another server one by one.
Now the the problem is file names are like LTR.PDF ,LTR.PDF1 ,LTR.PDF2.....LTR.PDF10..upto 99
and these needs to be sent in sorted order.
is there a way to get... (10 Replies)
I have an interactive script which works terrific at processing a folder of unsorted files into new directories.
I am wondering how I could modify my script so that( upon execution) it provides an additional labelled summary file on my desktop that lists all of the files in each directory that... (4 Replies)
Hello experts, I have matrices sorted by position, there are 400k rows, 3000 columns.
ID CHR POS M1 M2 M3 M4 M5
ID1 1 1 4.6 2.6 2.1 3.5 4.2
ID2 1 100 3.6 2.9 3.2 2.6 2.5
ID3 1 1000 4.1... (9 Replies)
Discussion started by: senhia83
9 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)