10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hello, I am new in shell scripting. I need help regarding following.
I have 4 files generated by backups daily. I have stored the names of these 4 files into one file. i.e I have 4 files names as a, b, c & d and these names have been put into one file abcd.txt.
Now I want to cat each file in... (7 Replies)
Discussion started by: Ali Sarwar
7 Replies
2. Shell Programming and Scripting
Hello,
I am new to AWK and in UNIX in general. I am hoping you can help me out here.
Here is my data:
root@ubuntu:~# cat circuits.list
WORD1
AA
BB
CC
DD
Active
ISP1
ISP NAME1
XX-XXXXXX1
WORD1
AA
BB
CC (9 Replies)
Discussion started by: tattoostreet
9 Replies
3. Shell Programming and Scripting
Hello everyone,
I have thought about this for quite some time and know what I want to do but am having some trouble at it. I have a text file filled with numbers like this, there are more in the file obviously. Each number is separated by a space.
1 3 2 4 5
1 -1 1 0 -1 5The idea is... (7 Replies)
Discussion started by: tastybrownies
7 Replies
4. Shell Programming and Scripting
Hi all,
I jut use a loop to read lines from the user and redirect it to a file.
echo "Enter the line"
while read -r LINE
do
echo $LINE >> FILE
if ;then
break
fi
done
input
app... (1 Reply)
Discussion started by: Ananthdoss
1 Replies
5. Shell Programming and Scripting
Hi Experts,
I am tryin to read a file and while doing so i need to skip the lines which start with a hash (#) char.
I thought of using a goto command but a lot of guys on this site say its not the good way to program. Moreover I am using a ksh shell which deos not support goto command.
... (4 Replies)
Discussion started by: bankimmehta
4 Replies
6. Shell Programming and Scripting
Im trying to ssh to a remote machine to grep 'x info' *.log and Im able to get the grep output as expected but "after" the policies (1st 14 lines) - I need to skip the first 14 lines.
Its SunOS.
Plz help??? (7 Replies)
Discussion started by: anthonyraj75
7 Replies
7. Shell Programming and Scripting
Im trying to ssh to a remote machine to grep 'x info' *.log and Im able to get the grep output as expected but "after" the policies (1st 14 lines) - I need to skip the first 14 lines.
Its SunOS.
Plz help??? (1 Reply)
Discussion started by: anthonyraj75
1 Replies
8. Shell Programming and Scripting
Hi,
I have a file:
file.txt
1 word
2 word
word
word
3 word
4 word
and I would like to create a set:
set number = `cut -d" " -f1 ${1}` #${1} is the text file
but it should only contain the lines which begin with numbers,
and another set which contains the lines which begin with... (10 Replies)
Discussion started by: shira
10 Replies
9. Shell Programming and Scripting
hi,
I have a shell script that searches for a particular pattern in all the files inside a directory, and gives the count of that pattern occurences in a file.
Now i should not count the pattern if it exists in side a { .... }, as shown below.
{
......
.....
.... PATTERN1.......... (1 Reply)
Discussion started by: divak
1 Replies
10. UNIX for Advanced & Expert Users
I have a file that has a list of numbers in it. Each line has a different number. I am trying to create some sort of loop within a script that will pick the numbers up on lines 1 and 2 and then put those figures into the script. It then goes through the process then loops back and reads lines 2 and... (5 Replies)
Discussion started by: mariner
5 Replies
tail(1) General Commands Manual tail(1)
NAME
tail - Writes a file to standard output, beginning at a specified point
SYNOPSIS
tail [-f | -r] [-c number | -n number] [file]
tail [+number | -number] [unit] [-f | -r] [file]
The tail command writes the named file (standard input by default) to standard output, beginning at a point you specify.
The second synopsis form of this command is obsolete, and support may be withdrawn at any time.
STANDARDS
Interfaces documented on this reference page conform to industry standards as follows:
tail: XCU5.0
Refer to the standards(5) reference page for more information about industry standards and associated tags.
OPTIONS
Displays the remainder of the file from the starting point number where number is measured in bytes. The sign of number affects the loca-
tion in the file at which to begin the copying: Copying begins relative to the beginning of the file. Copying begins relative to the end
of the file. Copying begins relative to the end of the file.
The origin for counting is 1, that is, -c +1 represents the first byte of the file, -c -1 the last. Does not end after it copies
the last line of the input file if the input file is not read from a pipe, but enters an endless loop in which it sleeps for a sec-
ond and then attempts to read and copy further records from the input file. Thus, it can be used to monitor the growth of a file
being written by another process. Has no effect if specified with -r. Displays remainder of file from the starting point number
where number is measured in lines. The sign of number affects the location in the file, measured in lines, to begin the copying:
Copying begins relative to the beginning of the file. Copying begins relative to the end of the file. Copying begins relative to
the end of the file.
The origin for counting is 1, that is, -n +1 represents the first line of the file, -n -1 the last. [Tru64 UNIX] Causes tail to
print lines from the end of the file in reverse order. The default for -r is to print the entire file this way. Overrides -f.
Begins reading number lines (l), 512-byte blocks (b), kilobyte blocks (k), characters (c and m) from the end of the input. The m
argument counts mulktibyte characters as single-byte characters, while c counts characters byte-by-byte but does not break mulk-
tibyte characters.
The default unit is l for lines. The default number is 10 for all units. Begins reading number lines (l), 512-byte blocks (b),
1-kilobyte blocks (k), or characters (c and m) from the beginning of the input. The m argument counts mulktibyte characters as sin-
gle-byte characters, while c counts characters byte-by-byte but does not break mulktibyte characters.
The default unit is l for lines. The default number is 10 for all units.
In the non-obsolescent form, if you do not specify either -c or n, -n 10 is the default.
DESCRIPTION
If you do not specify -f, -r, -number, or +number, tail begins reading 10 lines before the end of the file. The default starting point is -
(end of input), l (lines) is the default unit, and 10 is the default number.
By specifying +, you can direct tail to read from the beginning of the file. By specifying a number or a unit, or both, you can change the
point at which tail begins reading.
[Tru64 UNIX] The unit argument can specify lines, blocks, or characters. The tail command can begin reading number (10 by default) units
from either the end or the beginning of the file.
[Tru64 UNIX] The block size is either 512 bytes or 1 kilobyte.
NOTES
When the input is a text file containing mulktibyte characters, use the -c option cautiously since the output produced may not start on a
character boundary.
EXIT STATUS
The following exit values are returned: Successful completion. An error occurred.
EXAMPLES
To display the last 10 lines of a file named notes, enter: tail notes To specify how far from the end to start, enter: tail -20 notes
This displays the last 20 lines of notes. To specify how far from the beginning to start, enter: tail +200c notes | more
This displays notes a page at a time, starting with the 200th character from the beginning. To follow the growth of a file named
accounts, enter: tail -1 -f accounts
This displays the last line of accounts. Once every second, tail displays any lines that have been added to the file. This contin-
ues until stopped by pressing the Interrupt key sequence.
ENVIRONMENT VARIABLES
The following environment variables affect the execution of tail: Provides a default value for the internationalization variables that are
unset or null. If LANG is unset or null, the corresponding value from the default locale is used. If any of the internationalization vari-
ables contain an invalid setting, the utility behaves as if none of the variables had been defined. If set to a non-empty string value,
overrides the values of all the other internationalization variables. Determines the locale for the interpretation of sequences of bytes
of text data as characters (for example, single-byte as opposed to mulktibyte characters in arguments and input files). Determines the
locale for the format and contents of diagnostic messages written to standard error. Determines the location of message catalogues for the
processing of LC_MESSAGES.
SEE ALSO
Commands: cat(1), head(1), more(1), page(1), pg(1)
Standards: standards(5)
tail(1)