06-10-2013
wow!! you are the best!! That is exactly what I needed.
9 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
need help on this. let say i hv 1 file contains as below:
STRING
Description bla bla bla
Description yada yada yada
Data bla bla
Data yada yada
how do i want to display n lines after the string?
thanks in advance! (8 Replies)
Discussion started by: ashterix
8 Replies
2. UNIX for Dummies Questions & Answers
Hi All,
Please let me know how I can put a comment (e.g // or #) to more than 50 lines using vi editor in a .cpp/.sh file.
Thanks in advance. (3 Replies)
Discussion started by: artikulkarni
3 Replies
3. UNIX for Advanced & Expert Users
I have a requirement like below.I need to Comment some lines in a file.
File contains following information.
{
attribute1
attribute2
atrribute3
attribute4
attribute5
attribute6
attribute7
}
I have a requirement like some times i need to comment lines 3 to before '}' and some... (1 Reply)
Discussion started by: ukatru
1 Replies
4. Shell Programming and Scripting
i need to grep a STRING_A & the next few lines after the STRING_A
example file:
STRING_A yada yada
line 1
line 2
STRING_B yada yada
line 1
line 2
line 3
STRING_A yada yada
line 1
line 2
line 3
line 4
STRING_A yada yada
line 1
line 2
line 3
line 4 (7 Replies)
Discussion started by: ashterix
7 Replies
5. Shell Programming and Scripting
I must write a script to change all C++ like comments:
// this is a comment
to this one
/* this is a comment */
How to do it by sed? With file:
#include <cstdio>
using namespace std; //one
// two
int main() {
printf("Example"); // three
}//four
the result should be: (2 Replies)
Discussion started by: black_hawk
2 Replies
6. UNIX for Advanced & Expert Users
I often find myself grepping source code for a variable name and many times the name would be present in comment lines that I 'd prefer not to see. Do you guys know any tricks to filter out comments?
Example:
snippet of the source code
/***
* type comment 1
***/
void ... (7 Replies)
Discussion started by: migurus
7 Replies
7. Shell Programming and Scripting
I need some help with adding lines to file and substitute a pattern.
Ok I have a file:
#cat names.txt
name: John Doe
stationed: 1
name: Michael Sweets
stationed: 41
.
.
.
And would like to change it to:
name: John Doe
employed
permanently
stationed: 1-office (7 Replies)
Discussion started by: hemo21
7 Replies
8. UNIX for Dummies Questions & Answers
Hi,
I am using BASH. How can I remove any lines in a text file that are either blank or begin with a # (ie. comments)? Thanks in advance.
Mike (3 Replies)
Discussion started by: msb65
3 Replies
9. Shell Programming and Scripting
Hello people!
I would like to create one script following this stage
I have one directory with 100 files
File001
File002
...
File100
(This is the format of content of the 100 files)
2012/03/10 12:56:50:221875936 1292800448912 12345 0x00 0x04 0
then I have one... (0 Replies)
Discussion started by: Abv_mx81
0 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