Dear experts
I am learning awk command through some books on Solaris 8.
I have tested the folloing command
awk 'BEGIN { print match ("And" , /d/)}'
then the result is as following
awk: syntax error near line 1
awk: illegal statement near line 1
Could you please help on this and just... (4 Replies)
I am new to Unix scripting. I would like to know if someone can point me to a site which lists any built-in commands in there scripted form. I thought to start with the basics and learn from example.
Thanks
JSP (2 Replies)
I'm playing around with the kqemu accelerator for the QEMU virtualization software. I can't remember which version of gcc I used to build my kernel. I have 3.4.6 and 4.1.1 on this (Gentoo) system. I seem to remember there is some command I can run against binaries that will tell me what gcc (and... (5 Replies)
I'm using Mac OS 10.2.2 and I need to find a command line hex editor. I figure there's already one built-in, but I just don't know enough about Unix, yet. Basically, what I want to do is tell the hexeditor to open a file, replace a specific offset with a new value, then put the resulting file... (7 Replies)
Is there any command or VARIABLE in unix to display only bash builtin commands?. Some days back I worked on that, but now I do not remember.
Can anyone please reply for this?... (4 Replies)
Hi All,
I am faced with a problem. I came to know that large scale problems in MATLAB are very slow and with loops they are even slower.
I have the MATLAB script below that does some large scale computation for my school project work. I've been running this code for long now but all it did... (1 Reply)
Hi, guys
I just wanted to sort the elements of an array ascendingly.
I know the following code does work well:
array=(13 435 8 23 100)
for i in {0..4}
do
j=$((i+1))
while ]
do
if } -le ${array} ]]
then :
else
min=${array}
${array}=${array}
${array}=$min
fi... (5 Replies)
Hello Experts,
I am truly a beginner in shell and perl . Need an urgent help with sorting a file. please help. wouldn't mind whether in perl or shell script.
Here are the details.
------------------------------------------------------
Input Text file EX:... (9 Replies)
I am working on converting shell to Perl script. In shell we have built in function
trap
Do you know alternative in Perl or actually we don't need it?
Thanks for contribution (3 Replies)
Discussion started by: digioleg54
3 Replies
LEARN ABOUT REDHAT
versionsort
SCANDIR(3) Linux Programmer's Manual SCANDIR(3)NAME
scandir, alphasort, versionsort - scan a directory for matching entries
SYNOPSIS
#include <dirent.h>
int scandir(const char *dir, struct dirent ***namelist,
int(*select)(const struct dirent *),
int(*compar)(const struct dirent **, const struct dirent **));
int alphasort(const void *a, const void *b);
int versionsort(const void *a, const void *b);
DESCRIPTION
The scandir() function scans the directory dir, calling select() on each directory entry. Entries for which select() returns non-zero are
stored in strings allocated via malloc(), sorted using qsort() with the comparison function compar(), and collected in array namelist which
is allocated via malloc(). If select is NULL, all entries are selected.
The alphasort() and versionsort() functions can be used as the comparison function compar(). The former sorts directory entries using str-
coll(3), the latter using strverscmp(3) on the strings (*a)->d_name and (*b)->d_name.
RETURN VALUE
The scandir() function returns the number of directory entries selected or -1 if an error occurs.
The alphasort() and versionsort() functions return an integer less than, equal to, or greater than zero if the first argument is considered
to be respectively less than, equal to, or greater than the second.
ERRORS
ENOMEM Insufficient memory to complete the operation.
CONFORMING TO
None of these functions is in POSIX. The functions scandir() and alphasort() are from BSD 4.3, and have been available under Linux since
libc4. Libc4 and libc5 use the more precise prototype
int alphasort(const struct dirent **a, const struct dirent **b);
but glibc 2.0 returns to the imprecise BSD prototype.
The function versionsort() is a GNU extension, available since glibc 2.1. Since glibc 2.1, alphasort() calls strcoll(3); earlier it used
strcmp(3).
EXAMPLE
/* print files in current directory in reverse order */
#include <dirent.h>
main(){
struct dirent **namelist;
int n;
n = scandir(".", &namelist, 0, alphasort);
if (n < 0)
perror("scandir");
else {
while(n--) {
printf("%s
", namelist[n]->d_name);
free(namelist[n]);
}
free(namelist);
}
}
SEE ALSO closedir(3), fnmatch(3), opendir(3), readdir(3), rewinddir(3), seekdir(3), strcmp(3), strcoll(3), strverscmp(3), telldir(3)GNU 2001-12-26 SCANDIR(3)