Hi all,
can some one help me in chmod command, and let me know the various combinations for this command.
for : eg chmod -R 777 <dir names>
this gives all rights to all but i want the specific access levels kindly help me out in this issue.
Thank you,
lakshmanan (2 Replies)
If i want to display a banner that says Happy Bday, but I want to put that output banner into a file called bday4me,
could I use the command (echo) or (banner -w35) Happy Bday >> bday4me
would this command work? Sorry for asking, but i'm at home just now and don't have access to a UNIX... (3 Replies)
Hi all,
Can you tell me how to change the prompt color (only the path part) when I chnange directory with "cd"?
I use the sequence below in ".bashrc" (Solaris 8) to change my prompt colors and I'd like to modify it to change the path color when I cange directory.
PSC() { echo -ne "\"; }... (0 Replies)
Hi.,
Last modified time of the folder is changing when I view the file inside the directory. Here is the test on sample directory. I believe that ls -l commands gives the time detail w.r.t last modified time. Pl. suggest.
bash-3.2$ mkdir test
bash-3.2$ cd test
bash-3.2$ touch myfile.txt... (2 Replies)
Hey All,
I want to get the access time of files in a directory.
I used ls -lu on a directory and picked a file that had the access time of Mar 1 and used cat to get the contents of the file. Then I used the ls -lu again and the access time changed on that file. Perfect !!
Now if I cat a... (10 Replies)
This piece of code is in a shell script I'm trying to modify to run on my system.
sed s:nu\\t.\*:"nu=0"
It's clearly a substitute script which replaces nu\\t.\* with nu = 0.
What exactly does nu\\t.\* demarcate though-- I thought it was just the previous nu = xxxxx (which existed and is... (3 Replies)
I am trying to do the following task :
export ENV=aaa
export ENV_PATH=$(cd /apps | ls | grep $ENV)
However, it's not working. What's the way to change to directory and search some file in that directory in single command
Please help. (2 Replies)
When I run the below bash I get the expected output, which is the sum of all matching targets less than 20 in $file1. The filename in the directory is fixed (in bold).
for file1 in /home/cmccabe/Desktop/test/panel/reads/16-0000_EPIL70.txt ; do
bname=`basename $file1`
... (3 Replies)
Discussion started by: cmccabe
3 Replies
LEARN ABOUT REDHAT
uname
UNAME(2) Linux Programmer's Manual UNAME(2)NAME
uname - get name and information about current kernel
SYNOPSIS
#include <sys/utsname.h>
int uname(struct utsname *buf);
DESCRIPTION
uname returns system information in the structure pointed to by buf. The utsname struct is defined in <sys/utsname.h>:
struct utsname {
char sysname[];
char nodename[];
char release[];
char version[];
char machine[];
#ifdef _GNU_SOURCE
char domainname[];
#endif
};
The length of the arrays in a struct utsname is unspecified; the fields are NUL-terminated.
RETURN VALUE
On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
ERRORS
EFAULT buf is not valid.
CONFORMING TO
SVr4, SVID, POSIX, X/OPEN. There is no uname call in BSD 4.3.
The domainname member (the NIS or YP domain name) is a GNU extension.
NOTES
This is a system call, and the operating system presumably knows its name, release and version. It also knows what hardware it runs on.
So, four of the fields of the struct are meaningful. On the other hand, the field nodename is meaningless: it gives the name of the
present machine in some undefined network, but typically machines are in more than one network and have several names. Moreover, the kernel
has no way of knowing about such things, so it has to be told what to answer here. The same holds for the additional domainname field.
To this end Linux uses the system calls sethostname(2) and setdomainname(2). Note that there is no standard that says that the hostname
set by sethostname(2) is the same string as the nodename field of the struct returned by uname (indeed, some systems allow a 256-byte host-
name and an 8-byte nodename), but this is true on Linux. The same holds for setdomainname(2) and the domainname field.
The length of the fields in the struct varies. Some operating systems or libraries use a hardcoded 9 or 33 or 65 or 257. Other systems use
SYS_NMLN or _SYS_NMLN or UTSLEN or _UTSNAME_LENGTH. Clearly, it is a bad idea to use any of these constants - just use sizeof(...). Often
257 is chosen in order to have room for an internet hostname.
There have been three Linux system calls uname(). The first one used length 9, the second one used 65, the third one also uses 65 but adds
the domainname field.
Part of the utsname information is also accessible via sysctl and via /proc/sys/kernel/{ostype, hostname, osrelease, version, domainname}.
SEE ALSO uname(1), getdomainname(2), gethostname(2)Linux 2.5.0 2001-12-15 UNAME(2)