Here
Document
we
are pretty much aware of the re direction in Linux .When we use
#
echo 'hello world' >output
#
cat <output
The
first line writes "hello world" to the file "output",
the second reads it back and writes it to standard output ( To
Terminal)
Then
there are "here" documents:
#
cat <<EOF
>
hello
>
world
>
EOF
A
"here" document is essentially a temporary, nameless...
Monday, February 4, 2013
File Descriptors In Linux
As
we all know that every thing in Linux is a file. Any program that
runs on a Linux machine has access to something called a €œFile
Descriptor Table. A This table acts as a map providing the process
access to files, directories, unnamed pipes, named pipes, sockets and
kernel-level data structures. This table exists for each process.
There
are 3 standard file descriptors accessible inside the bash shell.
They are
0
-...
Controlling Resources
Many
Times as a Sys admin,I see users create different scripts or process
that cause a system failure. Many times there are done with out the
knowledge of the scripts or process effectively.
One
of the dangers associated with the thin client model is that a
runaway process might eat up all of the available system memory
and/or cpu on the host system. When this happens, the performance on
that system can degrade resulting...
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