10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi !
I need some help with a script I am writing.
I am trying to compare two files, the first file being in this format :
Header1
Text1-1
Text1-2
Text1-3
Header2
Text2-1
etc...
For each header, I want to check if it appears in the second file, and if it is the case print the header... (4 Replies)
Discussion started by: jbi
4 Replies
2. Shell Programming and Scripting
Hi guys,
I was wondering if there was an easy solution, using tcsh, to print out lines that appear twice with a given pattern in a file?
So if I am looking for lines with "test" in a given file that contains:
blah
test blah1
blah //don't print this out as it doesn't have... (3 Replies)
Discussion started by: chu816
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3. Shell Programming and Scripting
Hi,
I'm trying to auto generate some php files with a default preamble at the top which is a block comment.
The problem is that my output has no new lines and it looks like the output from "ls" is being printed after everyline
This is my code
#!/bin/bash
read -d '' pre_amble... (1 Reply)
Discussion started by: racshot65
1 Replies
4. UNIX for Dummies Questions & Answers
hay i need to display middle line:
1
2
3
4
5
how can i display 3-4? (6 Replies)
Discussion started by: margan_ron
6 Replies
5. Shell Programming and Scripting
Hello,
I want to print a number of lines of a file after a specific expression of a line.
I have this sed command but it prints only 1 line after the expression.
How could I adapt it to print for instance 10 lines after or 15 lines after ?
sed -n '/regexp/{n;p;}'
Thx & Regs,
Rany. (5 Replies)
Discussion started by: rany1
5 Replies
6. UNIX for Dummies Questions & Answers
Assume that the text file contains over 40 lines. How do you do this?!?!? (5 Replies)
Discussion started by: phunkypants
5 Replies
7. UNIX for Dummies Questions & Answers
I am trying to print a simple ascii file but it comes out as a staggered output. I know there's a simple solution but can't remember it, am a little rusty.
eg. a file that look like
aa
bbb
cccc
would print out like
aa
bbb
ccccc
Any pointers would be... (5 Replies)
Discussion started by: lordvoldemort
5 Replies
8. Shell Programming and Scripting
Hi,
A very Good Evening to All,
I am writing a script for my application. I have a file with 1000 lines. Among that 1000 lines i am searching for a particular string. And from that string i need to pull all the data in to a seperate file.
For example the contents of my file is as below.
... (4 Replies)
Discussion started by: intiraju
4 Replies
9. UNIX for Dummies Questions & Answers
Dear users,
I need to count the number of lines in a simple text file and print the number on the first line of that same file.
I know I can count the lines using
wc -l file.txt
this gives for example
100 file.txt
I need the number 100 to be printed at the very top of file.txt... (2 Replies)
Discussion started by: jenjen_mt
2 Replies
10. UNIX for Dummies Questions & Answers
as the title, I had try use "wc -l test.txt" but it give me "<many spaces> 384 test.txt" but the result I want is just "384" could any person can help me that?
Thx:( (5 Replies)
Discussion started by: a8111978
5 Replies
head(1) User Commands head(1)
NAME
head - display first few lines of files
SYNOPSIS
/usr/bin/head
/usr/bin/head [-number | -n number] [filename]...
ksh93
head [-qv] [-n lines] [-c chars] [-s skip][filename]...
DESCRIPTION
/usr/bin/head
The head utility copies the first number of lines of each filename to the standard output. If no filename is given, head copies lines from
the standard input. The default value of number is 10 lines.
When more than one file is specified, the start of each file looks like:
==> filename <==
Thus, a common way to display a set of short files, identifying each one, is:
example% head -9999 filename1 filename2 ...
ksh93
The head built-in in ksh93 is associated with the /bin and /usr/bin paths. It is invoked when head is executed without a pathname prefix
and the pathname search finds a /bin/head or /usr/bin/head executable.
head copies one or more input files to standard output, stopping at a designated point for each file or to the end of the file whichever
comes first. Copying ends at the point indicated by the options. By default, a header of the form ==> filename <== is output before all but
the first file but this can be changed with the -q and -v options. If no file is given, or if the file is -, head copies from standard
input starting at the current location.
The option argument for -c and -s can optionally be followed by one of the following characters to specify a different unit other than a
single byte:
b 512 bytes
k 1-kilobyte
m 1-megabyte
For backwards compatibility, -number is equivalent to -n number.
OPTIONS
/usr/bin/head
The following options are supported by /usr/bin/head:
-n number The first number lines of each input file is copied to standard output. The number option-argument must be a positive decimal
integer.
-number The number argument is a positive decimal integer with the same effect as the -n number option.
If no options are specified, head acts as if -n 10 had been specified.
ksh93
The following options are supported by the head built-in command in ksh93:
-n Copy lines from each file. The default value is 10.
--lines=lines
-c Copy chars bytes from each file.
--bytes=chars
-q Never output filename headers.
--quiet|silent
-s Skip skip characters or lines from each file before copying.
--skip=skip
-v Always output filename headers.
--verbose
OPERANDS
The following operand is supported:
filename A path name of an input file. If no file operands are specified, the standard input is used.
USAGE
See largefile(5) for the description of the behavior of head when encountering files greater than or equal to 2 Gbyte ( 2^31 bytes).
EXAMPLES
Example 1 Writing the First Ten Lines of All Files
The following example writes the first ten lines of all files, except those with a leading period, in the directory:
example% head *
ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of head: LANG, LC_ALL, LC_CTYPE, LC_MES-
SAGES, and NLSPATH.
EXIT STATUS
The following exit values are returned:
0 Successful completion.
>0 An error occurred.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
/usr/bin/head
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
|CSI |Enabled |
+-----------------------------+-----------------------------+
|Interface Stability |Committed |
+-----------------------------+-----------------------------+
|Standard |See standards(5). |
+-----------------------------+-----------------------------+
ksh93
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
|Interface Stability |See below. |
+-----------------------------+-----------------------------+
The ksh93 built-in binding to /bin and /usr/bin is Volatile. The built-in interfaces are Uncommitted.
SEE ALSO
cat(1), ksh93(1), more(1), pg(1), tail(1), attributes(5), environ(5), largefile(5), standards(5)
SunOS 5.11 2 Nov 2007 head(1)