Thank you everyone who helped me here. I am asking is there a way to do this with head and tail commands ?
---------- Post updated at 09:57 PM ---------- Previous update was at 09:55 PM ----------
Quote:
Originally Posted by bakunin
It might also be worth the time to consult the manual page of sed: suppress default printing and selectively print the desired lines.
Well sir I am a total beginner to the commands. So I really have no idea what you mean. If you could give an example for some more info it would really be helpful. Thanks for replying though.
No sir. We are not here to do your homework for you. (And those who posted full solutions to your homework problem are subject to infractions for giving inappropriate responses to homework questions.) The suggestion bakunin made is well worth your attention. We all assume that you should know about the man utility and that the command:
would give you guidance on how to use the sed utility.
As you have already found out, removing lines from the middle of a set of lines to be printed just using head and tail in a single pipeline is, at best, tricky. (I didn't get enough sleep last night to say it is impossible, but a way to do it this way is not immediately obvious to me.)
Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
1. The problem statement, all variables and given/known data:
Using the fixed length field file called famous.dat make a one-line Unix command - using pipe(s) - to display an... (5 Replies)
i have a input of csv file as below but the sequence of column get changed.
I,e it is not necessary that name comes first then age and rest all, it may vary.
name,age,marks,roll,section
kevin,25,80,456,A
Satch,23,56,789,B
Meena,24,78,H245,C
So i want to print that column entires which... (12 Replies)
Hi everyone,
I have UNIX this semester and I am just getting started with the commands. An interesting question came up while discussing the head and tail commands.
Suppose that I have text file with the following data in the following format-:
NAME ROLL MARKS
Sam 05 ... (2 Replies)
Hi guys !
I generated the power set of the set S={a,b,c} using crunch:
crunch 1 3 abc
and get the 39 possible subsets:
a
b
c
aa
ab
ac
ba
bb
bc
ca
cb
cc
… (2 Replies)
Hi,
I need to display specific columns using select statement and spooled to a file and sending it as e-mail. But i am not seeing column header in my output even i use SET HEADING ON.//PREDEFINED LOGIN DETAILS
${ORACLE_HOME}/bin/sqlplus -s ${DB_LOGIN}/${DB_PASSWD} <<EOF
SET FEEDBACK OFF
SET... (1 Reply)
Hi Team,
Not getting the file output inside my email which i am sending from unix box. . Please refer the below code :
#!/bin/sh
{
sleep 5
echo ehlo 10.56.185.13
sleep 3
echo mail from: oraairtel@CNDBMUREAPZP02.localdomain
sleep 3
echo rcpt to: saurabhtripathi@anniksystems.com... (1 Reply)
Hi All,
I want to send the csv to an email address.
I have tried the below two approaches.
Approach1: Got error -ksh: uuencode: not found
$ uuencode test_file.csv test_file.csv | mailx -s "Attaching test" msdc.kiran@gmail.com </usr/home/test_file.csv
-ksh: uuencode: not found
Approach2:... (6 Replies)
Discussion started by: ROCK_PLSQL
6 Replies
LEARN ABOUT DEBIAN
shell-quote
SHELL-QUOTE(1p) User Contributed Perl Documentation SHELL-QUOTE(1p)NAME
shell-quote - quote arguments for safe use, unmodified in a shell command
SYNOPSIS
shell-quote [switch]... arg...
DESCRIPTION
shell-quote lets you pass arbitrary strings through the shell so that they won't be changed by the shell. This lets you process commands
or files with embedded white space or shell globbing characters safely. Here are a few examples.
EXAMPLES
ssh preserving args
When running a remote command with ssh, ssh doesn't preserve the separate arguments it receives. It just joins them with spaces and
passes them to "$SHELL -c". This doesn't work as intended:
ssh host touch 'hi there' # fails
It creates 2 files, hi and there. Instead, do this:
cmd=`shell-quote touch 'hi there'`
ssh host "$cmd"
This gives you just 1 file, hi there.
process find output
It's not ordinarily possible to process an arbitrary list of files output by find with a shell script. Anything you put in $IFS to
split up the output could legitimately be in a file's name. Here's how you can do it using shell-quote:
eval set -- `find -type f -print0 | xargs -0 shell-quote --`
debug shell scripts
shell-quote is better than echo for debugging shell scripts.
debug() {
[ -z "$debug" ] || shell-quote "debug:" "$@"
}
With echo you can't tell the difference between "debug 'foo bar'" and "debug foo bar", but with shell-quote you can.
save a command for later
shell-quote can be used to build up a shell command to run later. Say you want the user to be able to give you switches for a command
you're going to run. If you don't want the switches to be re-evaluated by the shell (which is usually a good idea, else there are
things the user can't pass through), you can do something like this:
user_switches=
while [ $# != 0 ]
do
case x$1 in
x--pass-through)
[ $# -gt 1 ] || die "need an argument for $1"
user_switches="$user_switches "`shell-quote -- "$2"`
shift;;
# process other switches
esac
shift
done
# later
eval "shell-quote some-command $user_switches my args"
OPTIONS --debug
Turn debugging on.
--help
Show the usage message and die.
--version
Show the version number and exit.
AVAILABILITY
The code is licensed under the GNU GPL. Check http://www.argon.org/~roderick/ or CPAN for updated versions.
AUTHOR
Roderick Schertler <roderick@argon.org>
perl v5.8.4 2005-05-03 SHELL-QUOTE(1p)