-n, --lines=[-]K
print the first K lines instead of the first 10; with the lead-
ing `-', print all but the last K lines of each file
So -n expects the number of lines. If you're not giving it a number of lines, don't bother telling head -n.
You're improperly nesting your if's. If you want to do if/else, use elif. Or you could break it into two completely separate if-statements. And you still have the useless ;'s there.
And the 'return' still doesn't do anything like what you think it does. It doesn't jump to the top of the script. To loop, you need a loop.
Code:
if [ "$e" = 'y' ] || [ "$e" = 'Y' ]
then exit
elif [ "$e" = 'n'] || [ "$e" = 'N' ]
return
fi # only one fi
The first argument is $1. So ls -l $1. There's another argument you can give ls to reverse its order, which you can find via man ls.
You can tell how many arguments there are with the $# special variable. Something like if [ "$#" -eq 2 ] to do one thing when you have two arguments, and another when you don't.
You can redirect into a file with >. command > filename
so
Code:
ls -l $1
is going to do this step?:
Code:
"The long listing of the directory specified by the first command line argument, sorted in reversed alphabetic order."
I dont know how to use
Code:
>
to redirecte all of this results above:
Code:
echo "This is your username:" $USER
echo "This is the path of your login directory:" $HOME
cal 2012
echo "The amount of files in your directory are:";(ls ~|wc -l)
read n
if [ "$n" -lt 45 ]
then
head -n Rail-Stations.txt
fi
to the 2nd argument, because it is in the program, its not like outside the program. i did
Code:
if [ "$# -eq 2 ]
and then what should I do?
also, what can I do with the 2nd question?:
Code:
Find the first letter in alphabet from the input and count the input letters:Accept the input of a series of lower case alphabetic letters one at a time. The input ends with a 0. Find and display the first letter in alphabetic order and the count of total number of valid input letters. For example, input of d, g, t, w, q, b, h, d, s, 0 should result in b and 9.Any invalid input character (eg. #, $, 3, A) will cause an error message and be ignored.
Hi,
I want to write a script which will tail a particular file for 15 mins and then sleep for 10 mins and again tail for 15 mins. This cycle will go on for a limited period of time.
How can i ensure that tail command will run for 15 mins before calling sleep command
Thanks (6 Replies)
I have a script that runs every hour from the crontab (see the settings of the crontab below) (15 mins past the hour)
15 * * * * /home/usr/usr1/ProvAll
This script saves two files in the following format
now=`/bin/date '+%Y%m%d.%H%M%S'`
file1.$now (for example)
file1.20140722.031502... (12 Replies)
I need 5 mins old logs to be dumped into a a new file.
The date formats in the two log files are
Can you suggect for both formats ?
bash-3.2$ uname -a
SunOS myserver 5.10 Generic_150400-26 sun4v sparc sun4v
---------- Post updated 05-04-16 at 12:24 AM ---------- Previous update was... (2 Replies)
Hi,
system date format
Thu Jun 13 12:55:18 EDT 2019
My log date format
09.148.192.60 - - "GET /akamai/sureroute-test-object.html HTTP/1.1" 404 231
can someone please help me, how to get last 5mins of logs please ? I need the command
Please wrap your samples/codes in CODE TAGS,... (3 Replies)
04-16-2012
got no idea