04-20-2012
which part is not working. can you post error here.
tail -2 is equivalent to tail -n 2 so try tail -n ${n} infile and tail -${n} works for me
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Many of my servers' /etc/group file have many userid's that does not exist in /etc/passwd file and they need to be deleted.
This happened due to manual manipulation of /etc/passwd files.
I need to do this for 40 servers.
Can anyone help me in achieving this? Even reducing a step or two will be... (6 Replies)
Discussion started by: pdtak
6 Replies
2. UNIX for Dummies Questions & Answers
Hi,
Could anyone help me in changing a tabular format output to comma seperated file pls in K-sh. Its very urgent.
E.g : username empid
------------------------
sri 123
to
username,empid
sri,123
Thanks,
Hema:confused: (2 Replies)
Discussion started by: Hemamalini
2 Replies
3. Shell Programming and Scripting
Hi,
Need awk help to group and print lines to format the output as shown below
INPUT FORMAT
set echo on
set heading on
set spool on
/* SCHEMA1 */ CREATE TABLE T1;
/* SCHEMA1 */ CREATE TABLE T2;
/* SCHEMA1 */ CREATE TABLE T3;
/* SCHEMA1 */ CREATE TABLE T4;
/* SCHEMA1 */ CREATE TABLE T5;... (5 Replies)
Discussion started by: rajan_san
5 Replies
4. Shell Programming and Scripting
Hi.
I am reasonably new to awk, but have done quite a lot of unix scripting in the past. I have resolved the issues below with unix scripting but it runs like a dog. Moved to awk for speed and functionality but running up a big learning curve in a hurry, so hope there is some help here.
I... (6 Replies)
Discussion started by: mike.strategis
6 Replies
5. Shell Programming and Scripting
Hi,
I've the following two CSV files:
File1.csv File2.csv
Class,Student# Student#,Marks
1001,6001 6002,50
1001,6002 6001,60
1002,7000 ... (3 Replies)
Discussion started by: Matrix2682
3 Replies
6. Shell Programming and Scripting
Hi,
Suppose I have a csv file, each line look like this:
ABC Company, 1999, March, caucasian owned, 123 BroadWay NY 92939-2222
How do I create two new columns at the end, one for state, one for zip.
So that the line is
ABC Company, 1999, March, caucasian owned, 123 BroadWay NY... (2 Replies)
Discussion started by: grossgermany
2 Replies
7. UNIX Desktop Questions & Answers
This really is a dummy question but I'm stuck and out of time... I have a large file and out of it I only want to pick out lines starting with either "Pressure" or "N". I still need these lines to be in their original order.
example of text
Pressure 3
N 2
N 3
bla bla
bla bla
Pressure 4... (3 Replies)
Discussion started by: jenjen_mt
3 Replies
8. Shell Programming and Scripting
Hi Folks!
I have a file like this
000000006 dist:0.0 FILE ./MintRoute/MultiHopWMEWMA.nc LINE:305:1 NODE_KIND:131 nVARs:4 NUM_NODE:66 TBID:733 TEID:758
000000000 dist:0.0 FILE ./Route/MultiHopLEPSM.nc LINE:266:1 NODE_KIND:131 nVARs:4 NUM_NODE:66 TBID:601 TEID:626
000000001 ... (2 Replies)
Discussion started by: jackoverflow
2 Replies
9. Shell Programming and Scripting
Source 1
column1 column2 column 3 column4
1,ganesh,1,000,1
222,ram,2,000,5
222,ram,50,000,5
33,raju,5,000,7
33,raju,5,000,7
33,raju,5,000,8
33,raju,5,000,4
33,raju,5,000,1
In my .csv file, third column is having price value with comma (20,300), it has to be considered 1,000 as... (1 Reply)
Discussion started by: Ganesh L
1 Replies
10. Shell Programming and Scripting
Input data
COL_1,COL_2,COL_3,COL_4,COL_5,COL_6,COL_7,COL_8,COL_9,COL_10,COL_11,COL_12,COL_13
C,ABC,ABCD,3,ZZ,WLOA,2015-12-01,2016-12-01,975.73,ZZZ,P,111111.00,Y1 **GROUP1**
C,ABC,ABCD,3,ZZ,WLOA,2015-12-01,2016-12-01,975.73,ZZZ,P,222222.00,Y1 **GROUP1**... (2 Replies)
Discussion started by: Ads89
2 Replies
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