I understand your idea. You have a list sorted by ID and you process one ID at a time. You assume that the file being processed is too large for the memory allocated for this. I want to note the script I proposed earlier allows you to process an unsorted list. And the limits of RAM are limited only by the system-wide but I would continue only for a sorted list...
Last edited by nezabudka; 03-28-2020 at 08:45 AM..
Hi all,
in my csv file it'll look like this, and of course it may have more columns
US to UK;abc-hq-jcl;multimedia
UK to CN;def-ny-jkl;standard
DE to DM;abc-ab-klm;critical
FD to YM;la-yr-tym;standard
HY to MC;la-yr-ytm;multimedia
GT to KJ;def-ny-jrt;critical
I would like to group... (4 Replies)
Hi guys!
I'm new to scripting and I need to write a script in awk.
Here is example of file on which I'm working
ATOM 4688 HG1 PRO A 322 18.080 59.680 137.020 1.00 0.00
ATOM 4689 HG2 PRO A 322 18.850 61.220 137.010 1.00 0.00
ATOM 4690 CD ... (18 Replies)
Hi ,
Below is my sample data,I have this 8 column(A,B,C,D,E,F,G,H) in csv file.
A , B ,C ,D ,E ,F,G ,H
4141,127337,24,15,20,69,72.0,-3
4141,128864,24,15,20,65,66.0,-1
4141,910053,24,15,4,4,5.0,-1
4141,910383,24,15,22,3,4.0,-1
4141,496969,24,15,14,6,-24.0,-18... (7 Replies)
Hello Experts,
I have got a txt files which has multiple columns, I want to get the max, min and diff (max-min) for each column in the same txt file. Example:
cat file.txt
a 1 4
b 2 5
c 3 6
I want ouput like:
cat file.txt
a 1 4
b 2 5
c 3 6
Max 3 6
Min 1 4
Diff 2 2
awk 'min=="" ||... (4 Replies)
Hi guys,
I already search on the forum but i can't solve this on my own.
I have a lot of files like this:
And i need to print the line with the maximum value in last column but if the value is the same (2 in this exemple for the 3 last lines) i need get the line with the minimum value in... (4 Replies)
a,b,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,aa,bb,cc,dd,ee,ff,gg,hh,ii
a thru ii are digits and strings....
The awk needed....if coloumn 9 == i (coloumn 9 is string ), output the sum of x's(coloumn 22 ) in all records and sum of y's (coloumn 23 ) in all records in a file (records.txt).... (6 Replies)
Gents,
I have a big file file like this.
5100010002
5100010004
5100010006
5100010008
5100010010
5100010012
5102010002
5102010004
5102010006
5102010008
5102010010
5102010012
The file is sorted and I would like to find the min and max value, taking in the consideration key1... (3 Replies)
I have to ascend the number of two selected columns by horizontal manner.
For example, I have a data like this in csv file (tab delimited format)
08 1 19185 18010
16 4 7960 9339
01 6 516769 517428
09 9 51384 49270
I need to ascend the two columns numbers (horizontal manner) like as... (5 Replies)
Discussion started by: dineshkumarsrk
5 Replies
LEARN ABOUT BSD
ram
RAM(4) Kernel Interfaces Manual RAM(4)NAME
ram - ram disk driver
SYNOPSIS
/sys/conf/SYSTEM:
NRAM ram_size # RAM disk size (512-byte blocks)
major device number(s):
block: 3
minor device encoding:
must be zero (0)
DESCRIPTION
The ram pseudo-device provides a very fast extended memory store. It's use is intended for file systems like /tmp and applications which
need to access a reasonably large amount of data quickly.
The amount of memory dedicated to the ram device is controlled by the NRAM definition in units of 512-byte blocks. This is also patchable
in the system binary through the variable ram_size (though a patched system would have to be rebooted before any change took effect; see
adb(1)). This makes it easy to test the effects of different ram disk sizes on system performance. It's important to note that any space
given to the ram device is permanently allocated at system boot time. Dedicating too much memory can adversely affect system performance
by forcing the system to swap heavily as in a memory poor environment.
The block file accesses the ram disk via the system's buffering mechanism through a buffer sharing arrangement with the buffer cache. It
may be read and written without regard to physical disk records. There is no `raw' interface since no speed advantage is gained by such an
interface with the ram disk.
DISK SUPPORT
The ram driver does not support pseudo-disks (partitions). The special files refer to the entire `drive' as a single sequentially
addressed file.
A typical use for the ram disk would be to mount /tmp on it. Note that if this arrangement is recorded in /etc/fstab then /etc/rc will
have to be modified slightly to do a mkfs(8) on the ram disk before the standard file system checks are done.
FILES
/dev/ram block file
/dev/MAKEDEV script to create special files
/dev/MAKEDEV.local script to localize special files
SEE ALSO hk(4), ra(4), rl(4), rk(4), rp(4), rx(4), si(4), xp(4)dtab(5), autoconfig(8)DIAGNOSTICS
ram: no space. There is not enough memory to allocate the space needed by the ram disk. The ram disk is disabled. Any attempts to access
it will return an error.
ram: not allocated. No memory was allocated to the ram disk and an attempt was made to open it. Either not enough memory was available at
boot time or the kernel variable ram_size was set to zero.
BUGS
The ram driver is only available under 2.11BSD.
3rd Berkeley Distribution Januray 27, 1996 RAM(4)