09-06-2012
Linux 3.2.0-3-amd64 #1 SMP Thu Jun 28 09:07:26 UTC 2012 x86_64 GNU/Linux
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1. Shell Programming and Scripting
Hi All,
I am new to this shell scripting world. Struck up with a problem, can anyone of you please pull me out of this.
Requirement : Need to get the index of a substring from a parent string
Eg : index("Sandy","dy") should return 4 or 3.
My Approach :
I used Awk function index to... (2 Replies)
Discussion started by: sandeepms17
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2. UNIX for Dummies Questions & Answers
Hii i have a file with data as shown below. Here i need to remove duplicates of the rows in such a way that
it just checks for 2,3,4,5 column for duplicates.When deleting duplicates,retain largest row i.e with many columns with values should be selected.Then it must remove duplicates such that by... (11 Replies)
Discussion started by: reva
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3. Shell Programming and Scripting
Hello all,
I need to find the longest string in a select field and print that field.
I have tried a few different methods and I always end up one step from where I need to be.
Methods thus far:
nawk '{if (length($1) > long) long=length($1); if(length($1)==long) print $1}'
The above... (6 Replies)
Discussion started by: SEinT
6 Replies
4. Shell Programming and Scripting
I would be grateful if someone could help me. I am trying to write a .sh script in UNIX.
I have the following code;
User=john
User=james
User=ian
User=martin
for x in ${User}
do
print ${#x}
done
This produces the following output;
4
5
3
6 (12 Replies)
Discussion started by: mmab
12 Replies
5. Shell Programming and Scripting
Hi,
I am trying to figure out how to get the length of the longest column in the entire file (because the length varies from one row to the other)
I was doing this at first to check how many fields I have for the first row:
awk '{print NF; exit}' file
Now, I can do this:
awk '{ if... (4 Replies)
Discussion started by: MIA651
4 Replies
6. Shell Programming and Scripting
I am trying to search a given text in a file and find its last occurrence index. The task is to append the searched index in the same file but in a separate column. I am able to accomplish the task partially and looking for a solution.
Following is the detailed description:
names_file.txt
... (17 Replies)
Discussion started by: tarun.trehan
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7. Shell Programming and Scripting
I want to bring values in the second column into single line for uniq value in the first column.
My input
jvm01, Web 2.0 Feature Pack Library
jvm01, IBM WebSphere JAX-RS
jvm01, Custom01 Shared Library
jvm02, Web 2.0 Feature Pack Library
jvm02, IBM WebSphere JAX-RS
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8. Shell Programming and Scripting
Hi All,
I have a file like this(having 2 column).
Column 1: like a,b,c....
Column 2: having numbers.
I want to segregate those numbers based on column 1.
Example:
file.
a 5
b 9
b 620
a 710
b 230
a 330
b 1910 (4 Replies)
Discussion started by: Raza Ali
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9. Shell Programming and Scripting
Hello experts,
I am trying to unscramble a mixed signal into component signals.
Let the list of known signals be
$ cat tmplist
DU
DU4016
GFF
GFF2010
GFF201019
G2115
G211
DU40 (1 Reply)
Discussion started by: senhia83
1 Replies
10. UNIX for Beginners Questions & Answers
Hi,
Let's say I have a pipe-separated input like so:
name_10|A|BCCC|cat_1
name_11|B|DE|cat_2
name_10|A|BC|cat_3
name_11|B|DEEEEEE|cat_4
Using awk, for records with common field 2, I am trying to replace all the shortest substrings by the longest string in field 3.
In order to get the... (5 Replies)
Discussion started by: beca123456
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LEARN ABOUT CENTOS
slabinfo
SLABINFO(5) Linux Programmer's Manual SLABINFO(5)
NAME
/proc/slabinfo - kernel slab allocator statistics
SYNOPSIS
cat /proc/slabinfo
DESCRIPTION
Frequently used objects in the Linux kernel (buffer heads, inodes, dentries, etc.) have their own cache. The file /proc/slabinfo gives
statistics. For example:
% cat /proc/slabinfo
slabinfo - version: 1.1
kmem_cache 60 78 100 2 2 1
blkdev_requests 5120 5120 96 128 128 1
mnt_cache 20 40 96 1 1 1
inode_cache 7005 14792 480 1598 1849 1
dentry_cache 5469 5880 128 183 196 1
filp 726 760 96 19 19 1
buffer_head 67131 71240 96 1776 1781 1
vm_area_struct 1204 1652 64 23 28 1
...
size-8192 1 17 8192 1 17 2
size-4096 41 73 4096 41 73 1
...
For each slab cache, the cache name, the number of currently active objects, the total number of available objects, the size of each object
in bytes, the number of pages with at least one active object, the total number of allocated pages, and the number of pages per slab are
given.
Note that because of object alignment and slab cache overhead, objects are not normally packed tightly into pages. Pages with even one in-
use object are considered in-use and cannot be freed.
Kernels compiled with slab cache statistics will also have "(statistics)" in the first line of output, and will have 5 additional columns,
namely: the high water mark of active objects; the number of times objects have been allocated; the number of times the cache has grown
(new pages added to this cache); the number of times the cache has been reaped (unused pages removed from this cache); and the number of
times there was an error allocating new pages to this cache. If slab cache statistics are not enabled for this kernel, these columns will
not be shown.
SMP systems will also have "(SMP)" in the first line of output, and will have two additional columns for each slab, reporting the slab
allocation policy for the CPU-local cache (to reduce the need for inter-CPU synchronization when allocating objects from the cache). The
first column is the per-CPU limit: the maximum number of objects that will be cached for each CPU. The second column is the batchcount:
the maximum number of free objects in the global cache that will be transferred to the per-CPU cache if it is empty, or the number of
objects to be returned to the global cache if the per-CPU cache is full.
If both slab cache statistics and SMP are defined, there will be four additional columns, reporting the per-CPU cache statistics. The
first two are the per-CPU cache allocation hit and miss counts: the number of times an object was or was not available in the per-CPU cache
for allocation. The next two are the per-CPU cache free hit and miss counts: the number of times a freed object could or could not fit
within the per-CPU cache limit, before flushing objects to the global cache.
It is possible to tune the SMP per-CPU slab cache limit and batchcount via:
echo "cache_name limit batchcount" > /proc/slabinfo
FILES
<linux/slab.h>
VERSIONS
/proc/slabinfo exists since Linux 2.1.23. SMP per-CPU caches exist since Linux 2.4.0-test3.
NOTES
Since Linux 2.6.16 the file /proc/slabinfo is present only if the CONFIG_SLAB kernel configuration option is enabled.
COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
2007-09-30 SLABINFO(5)