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 OSX
tail
TAIL(1) BSD General Commands Manual TAIL(1)NAME
tail -- display the last part of a file
SYNOPSIS
tail [-F | -f | -r] [-q] [-b number | -c number | -n number] [file ...]
DESCRIPTION
The tail utility displays the contents of file or, by default, its standard input, to the standard output.
The display begins at a byte, line or 512-byte block location in the input. Numbers having a leading plus ('+') sign are relative to the
beginning of the input, for example, ``-c +2'' starts the display at the second byte of the input. Numbers having a leading minus ('-') sign
or no explicit sign are relative to the end of the input, for example, ``-n 2'' displays the last two lines of the input. The default start-
ing location is ``-n 10'', or the last 10 lines of the input.
The options are as follows:
-b number
The location is number 512-byte blocks.
-c number
The location is number bytes.
-f The -f option causes tail to not stop when end of file is reached, but rather to wait for additional data to be appended to the
input. The -f option is ignored if the standard input is a pipe, but not if it is a FIFO.
-F The -F option implies the -f option, but tail will also check to see if the file being followed has been renamed or rotated. The
file is closed and reopened when tail detects that the filename being read from has a new inode number. The -F option is ignored if
reading from standard input rather than a file.
-n number
The location is number lines.
-q Suppresses printing of headers when multiple files are being examined.
-r The -r option causes the input to be displayed in reverse order, by line. Additionally, this option changes the meaning of the -b,
-c and -n options. When the -r option is specified, these options specify the number of bytes, lines or 512-byte blocks to display,
instead of the bytes, lines or blocks from the beginning or end of the input from which to begin the display. The default for the -r
option is to display all of the input.
If more than a single file is specified, each file is preceded by a header consisting of the string ``==> XXX <=='' where XXX is the name of
the file unless -q flag is specified.
EXIT STATUS
The tail utility exits 0 on success, and >0 if an error occurs.
SEE ALSO cat(1), head(1), sed(1)STANDARDS
The tail utility is expected to be a superset of the IEEE Std 1003.2-1992 (``POSIX.2'') specification. In particular, the -F, -b and -r
options are extensions to that standard.
The historic command line syntax of tail is supported by this implementation. The only difference between this implementation and historic
versions of tail, once the command line syntax translation has been done, is that the -b, -c and -n options modify the -r option, i.e., ``-r
-c 4'' displays the last 4 characters of the last line of the input, while the historic tail (using the historic syntax ``-4cr'') would
ignore the -c option and display the last 4 lines of the input.
HISTORY
A tail command appeared in PWB UNIX.
BSD June 29, 2006 BSD