10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi. Can somebody please explain the following lines of KSH code for me? The code checks all sub directories in a specific location which are numbered (E.g. test_01, test_02 ... etc.), then finds the one with highest number and extracts that number from the dir name into the variable num. I'd just... (9 Replies)
Discussion started by: user052009
9 Replies
2. UNIX for Dummies Questions & Answers
I need someone to tell me how exactly works the following code αfter /etc/passwd :eek::
cat /etc/passwd|grep "^:"|sed '1,$s/^\(*\):*:\(*\):.*$/ \1 \2 /'|sort -nrk3 -t:I want a good explanation to understand the code please (4 Replies)
Discussion started by: kotsos13
4 Replies
3. UNIX for Dummies Questions & Answers
Hi all,
I need your help in understanding the meaning and syntax of the below nawk line.
Here is an extract of a script which I use daily and works well. The script extracts the hostnames and messages within a syslog file. I would also like to extract the message time in the 3rd column by... (2 Replies)
Discussion started by: wthomas
2 Replies
4. Shell Programming and Scripting
Hello,
Would someone be able to tell me exactly how this command works please?
awk '!x++'
As usual any help much appreciated (8 Replies)
Discussion started by: Grueben
8 Replies
5. Shell Programming and Scripting
Hello,
I have recently come across this awk program. Can some one shed some light on what is taking place.
awk '{!a++}END{for(i in a) if ( a >10 ) print a,i }' $FILE
Best Regards,
jaysunn (1 Reply)
Discussion started by: jaysunn
1 Replies
6. Shell Programming and Scripting
Can you please explain the following code plz?
my_cd=' '
while getopts :e: OPTION;
do
case "$OPTION" in
e) my_cd ="$OPTARG";;
esac
done
if ; then
echo " >>> ERROR - I am wrong"
echo " >>> ERROR - Hello"
exit 99
fi
What I don't understand is what is OPTION or... (3 Replies)
Discussion started by: RubinPat
3 Replies
7. Homework & Coursework Questions
I have the following piece of codes. Please explain it to me in great detail how are these codes working.
1. #include <stdio.h>
int main(){
int x;
x=0;
while (x<2 && fork()){
if (!fork()) execlp("echo","x++","x",0);
x++;
system("echo x+x");
}
}
2.
#include <stdio.h>
int i;... (1 Reply)
Discussion started by: prakashabii
1 Replies
8. Shell Programming and Scripting
Hi
I have a line/command which greps certain pattern () from the file and 22 lines AFTER that:
nawk '/\/{c=22}c&&c--' input_file
Can somebody explain the coding in this command (what " c&&c-- " does)? and how to modify this command to output 22 lines BEFORE this pattern () Thanks a lot ... (3 Replies)
Discussion started by: aoussenko
3 Replies
9. Shell Programming and Scripting
Hi I am new to shell script programming...
want to know the process of the following:
if
then
echo "$0: missing argument for option(s) :$MISSINGOPTARG"
echo "usage" $USAGE"
exit 1
fi (1 Reply)
Discussion started by: chandhar
1 Replies
10. Shell Programming and Scripting
Hi,
Could anyone please explain why we have arr=1 - what does this statement do?
awk -F\; 'FNR==NR{arr=1;next};$3 in arr' core.txt gmrd.txt
Any help appreciated (2 Replies)
Discussion started by: penfold
2 Replies
TZSELECT(8) Linux System Administration TZSELECT(8)
NAME
tzselect - select a timezone
SYNOPSIS
tzselect
DESCRIPTION
The tzselect program asks the user for information about the current location, and outputs the resulting timezone description to standard
output. The output is suitable as a value for the TZ environment variable.
All interaction with the user is done via standard input and standard error.
EXIT STATUS
The exit status is zero if a timezone was successfully obtained from the user, nonzero otherwise.
ENVIRONMENT
AWK Name of a Posix-compliant awk program (default: awk).
TZDIR Name of the directory containing timezone data files (default: /usr/share/zoneinfo).
FILES
TZDIR/iso3166.tab
Table of ISO 3166 2-letter country codes and country names.
TZDIR/zone.tab
Table of country codes, latitude and longitude, TZ values, and descriptive comments.
TZDIR/TZ
Time zone data file for timezone TZ.
SEE ALSO
tzfile(5), zdump(8), zic(8)
COLOPHON
This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
2007-05-18 TZSELECT(8)