09-23-2008
10 More Discussions You Might Find Interesting
1. 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
2. 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
3. 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
4. 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
5. 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
6. 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
7. 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
8. 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
9. 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
3 Replies
10. 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
LEARN ABOUT CENTOS
sigorset
SIGSETOPS(3) Linux Programmer's Manual SIGSETOPS(3)
NAME
sigemptyset, sigfillset, sigaddset, sigdelset, sigismember - POSIX signal set operations.
SYNOPSIS
#include <signal.h>
int sigemptyset(sigset_t *set);
int sigfillset(sigset_t *set);
int sigaddset(sigset_t *set, int signum);
int sigdelset(sigset_t *set, int signum);
int sigismember(const sigset_t *set, int signum);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
sigemptyset(), sigfillset(), sigaddset(), sigdelset(), sigismember():
_POSIX_C_SOURCE >= 1 || _XOPEN_SOURCE || _POSIX_SOURCE
DESCRIPTION
These functions allow the manipulation of POSIX signal sets.
sigemptyset() initializes the signal set given by set to empty, with all signals excluded from the set.
sigfillset() initializes set to full, including all signals.
sigaddset() and sigdelset() add and delete respectively signal signum from set.
sigismember() tests whether signum is a member of set.
Objects of type sigset_t must be initialized by a call to either sigemptyset() or sigfillset() before being passed to the functions
sigaddset(), sigdelset() and sigismember() or the additional glibc functions described below (sigisemptyset(), sigandset(), and sig-
orset()). The results are undefined if this is not done.
RETURN VALUE
sigemptyset(), sigfillset(), sigaddset(), and sigdelset() return 0 on success and -1 on error.
sigismember() returns 1 if signum is a member of set, 0 if signum is not a member, and -1 on error. On error, these functions set errno to
indicate the cause.
ERRORS
EINVAL sig is not a valid signal.
CONFORMING TO
POSIX.1-2001.
NOTES
Glibc notes
If the _GNU_SOURCE feature test macro is defined, then <signal.h> exposes three other functions for manipulating signal sets.
int sigisemptyset(sigset_t *set);
returns 1 if set contains no signals, and 0 otherwise.
int sigorset(sigset_t *dest, sigset_t *left, sigset_t *right);
places the union of the sets left and right in dest.
int sigandset(sigset_t *dest, sigset_t *left, sigset_t *right);
places the intersection of the sets left and right in dest.
sigorset() and sigandset() return 0 on success, and -1 on failure.
These functions are nonstandard (a few other systems provide similar functions) and their use should be avoided in portable applications.
SEE ALSO
sigaction(2), sigpending(2), sigprocmask(2), sigsuspend(2)
COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2013-04-19 SIGSETOPS(3)