Hello, I need some help to interpret the below output...
What is -/+ buffers/cache?
My understanding is, total RAM is 3986152 Bytes, used RAM is 3950904 bytes.
What is buffers and cached?? Can any one please interpret this output? It would be great help if some one can help me on this?
Last edited by pludi; 12-15-2009 at 04:17 PM..
Reason: code tags, please...
Hi,
How do I indent 4 spaces for standard UNIX commands like ls -ltr (or grep)?
For example, I want ls -ltra to output as:
<<spaces here>>-rw-r----- 1 a345696 rtkdevel 455 Dec 6 14:52 file1
<<spaces here>>-rw-r----- 1 a345696 rtkdevel 455 Dec 6 14:52 file2
<<spaces... (2 Replies)
Hi,
This might be a bit stupid question, but what command to use to create like a session which logs the command line, and output on to the screen?
Basically, a log to a file, where I can review what I had install, uninstall, etc.
Thank you (4 Replies)
Hi Friends,
I am really confused with the output of "free" command on redhat linux.
I can see caching and buffer output on two different areas on the output.
Please let me know whats the difference of these two different outputs.
Here I am pasting the command output of my server.
# free... (3 Replies)
Can i do this
Say one command
sed 's/:*/ /g' $summf
is returning
C1234
C2345
C3434
some no of rows, now this ouput i have to insert it into a DB table
how do i do this?? (2 Replies)
how can I get the df -h command output into excel format or csv file.
df -k | tr -s " " | sed 's/ /, /g' | sed '1 s/, / /g' | column -t
df -h | column -t
I have tried as above but the format is not right. I'm not able to load the format into a excel or a table.
... (2 Replies)
I'm just wondering is there any way to capture the output of a unix command in a csv format.
df -h gives the result of filesystem,free space,Used space, use %,mounted on.
Is there a way to capture the command output and format it as comma sparated or fixed length file. (3 Replies)
Hi,
I'm writing a script that connects through ssh (using "expect") and then is supposed to find whether a process on that remote machine is running or not. Here's my code (user, host and password are obviously replaced with real values in actual script):
#!/usr/bin/expect
set timeout 1... (3 Replies)
Hi
I have script to collect file system usage statistics from few remote unix hosts and email . On the UNIX system the column spacing is fine but the email output is not aligned properly. Any tips to fix this ? (1 Reply)
I have two questions on Linux's free command. Below, I have provided output from my home laptop (fedora 26 ) which has 16GB Physical RAM and a production server (RHEL 7.4) which has 24GB RAM.
Question1. What exactly does the buffer/cache column say in free command's output ? buffer/cache is... (9 Replies)
Discussion started by: omega3
9 Replies
LEARN ABOUT SUNOS
bcopy
bcopy(9F) Kernel Functions for Drivers bcopy(9F)NAME
bcopy - copy data between address locations in the kernel
SYNOPSIS
#include <sys/types.h>
#include <sys/sunddi.h>
void bcopy(const void *from, void *to, size_t bcount);
INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI).
PARAMETERS
from Source address from which the copy is made.
to Destination address to which copy is made.
bcount The number of bytes moved.
DESCRIPTION
bcopy() copies bcount bytes from one kernel address to another. If the input and output addresses overlap, the command executes, but the
results may not be as expected.
Note that bcopy() should never be used to move data in or out of a user buffer, because it has no provision for handling page faults. The
user address space can be swapped out at any time, and bcopy() always assumes that there will be no paging faults. If bcopy() attempts to
access the user buffer when it is swapped out, the system will panic. It is safe to use bcopy() to move data within kernel space, since
kernel space is never swapped out.
CONTEXT
bcopy() can be called from user or interrupt context.
EXAMPLES
Example 1: Copying data between address locations in the kernel:
An I/O request is made for data stored in a RAM disk. If the I/O operation is a read request, the data is copied from the RAM disk to a
buffer (line 8). If it is a write request, the data is copied from a buffer to the RAM disk (line 15). bcopy() is used since both the RAM
disk and the buffer are part of the kernel address space.
1 #define RAMDNBLK 1000 /* blocks in the RAM disk */
2 #define RAMDBSIZ 512 /* bytes per block */
3 char ramdblks[RAMDNBLK][RAMDBSIZ]; /* blocks forming RAM
/* disk
...
4
5 if (bp->b_flags & B_READ) /* if read request, copy data */
6 /* from RAM disk data block */
7 /* to system buffer */
8 bcopy(&ramdblks[bp->b_blkno][0], bp->b_un.b_addr,
9 bp->b_bcount);
10
11 else /* else write request, */
12 /* copy data from a */
13 /* system buffer to RAM disk */
14 /* data block */
15 bcopy(bp->b_un.b_addr, &ramdblks[bp->b_blkno][0],
16 bp->b_bcount);
SEE ALSO copyin(9F), copyout(9F)
Writing Device Drivers
WARNINGS
The from and to addresses must be within the kernel space. No range checking is done. If an address outside of the kernel space is
selected, the driver may corrupt the system in an unpredictable way.
SunOS 5.10 4 August 2003 bcopy(9F)