12-06-2007
String search - Command to find second occurance
Hi,
I am new to Unix world. Is there any command which can directly return the second occurance of a particular string in a file? Basically, I want to read the contents of the file from the second occurance of a particualr string. Can be implemented using a loop, but am just wondering if there is a command which can help me do so.
Please let me know.
TIA
Saurabh
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LEARN ABOUT OSX
iopending
iopending(1m) USER COMMANDS iopending(1m)
NAME
iopending - plot number of pending disk events. Uses DTrace.
SYNOPSIS
iopending [-c] [-d device] [-f filename] [-m mount_point] [interval [count]]
DESCRIPTION
This samples the number of disk events that are pending and plots a distribution graph. By doing this the "serialness" or "parallelness" of
disk behaviour can be distinguished. A high occurance of a pending value of more than 1 is an indication of saturation.
Since this uses DTrace, only users with root privileges can run this command.
OPTIONS
-c clear screen
-d device
instance name to snoop (eg, dad0)
-f filename
full pathname of file to snoop
-m mount_point
mountpoint for filesystem to snoop
EXAMPLES
Default output, print I/O summary every 1 second,
# iopending
Print 10 second samples,
# iopending 10
Print 12 x 5 second samples,
# iopending 5 12
Snoop events on the root filesystem only,
# iopending -m /
FIELDS
value number of pending events, 0 == idle
count number of samples @ 1000 Hz
load 1 min load average
disk_r total disk read Kb for sample
disk_w total disk write Kb for sample
IDEA
Dr Rex di Bona
DOCUMENTATION
See the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs may include full worked examples with ver-
bose descriptions explaining the output.
EXIT
iopending will run forever until Ctrl-C is hit, or the specified count is reached.
AUTHOR
Brendan Gregg [Sydney, Australia]
SEE ALSO
iosnoop(1M), iotop(1M), dtrace(1M)
version 0.60 Nov 01, 2005 iopending(1m)