03-12-2012
Maybe you should consider the use of a RAM disk to store these files containing huge data that are daily updated...
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1. Shell Programming and Scripting
Hi All,
I have list of multiple files with 7 fields all together. Those are being split to exact lines of 20000 each.
xaa
xab
:
:
:
xhx
Please advise me how to read from those files and in fact I need to invoke and sql update statement for each inputs values..
Regards, (5 Replies)
Discussion started by: cedrichiu
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2. Shell Programming and Scripting
Hi Masters,
Iam new to this Forum and this is my first post.
My question is:
I've some datafiles belongs the type (A, B, C) in the location 'export/home/lokiman '
dataA1.txt
dataB28.txt
dataC35.txt
1) I've to check the read permission for each file, if it not there then I've to... (1 Reply)
Discussion started by: lokiman
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3. Shell Programming and Scripting
Hi,
Can any one tell me if i can read two files in a shell script...
My actual requirement is to read the 1st text file and parse it to get the file code and use this file code to retrieve data from database and print the fetched data in the 2nd text file (I have parsed it and printed the... (2 Replies)
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4. Shell Programming and Scripting
Hi all,
I would like to simply read a file which lists a number of pathnames and files, then search and replace key strings using a few vi commands:
:1,$s/search_str/replace_str/g<return>
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5. UNIX for Dummies Questions & Answers
Hi,
I'd like to process multiple files. For example:
file1.txt
file2.txt
file3.txt
Each file contains several lines of data. I want to extract a piece of data and output it to a new file.
file1.txt ----> newfile1.txt
file2.txt ----> newfile2.txt
file3.txt ----> newfile3.txt
Here is... (3 Replies)
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6. Shell Programming and Scripting
Hi!
I'm new in awk and I need some help.
I have a folder with a lot of files and I need that awk do something in each file and print a new file with the output. The input file name should be modified when I print the outpu files.
Thanks in advance for help!
:-)
ciao (5 Replies)
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7. Shell Programming and Scripting
I am trying to create a script which will read 2 files and use the lines of file 1 for each line on file 2.
here's my sample code
cat $SBox |
while read line
do
cat $Date |
while read line
do $SCRIPTEXE <line from first file> $2 <line from 2nd file>
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8. UNIX for Dummies Questions & Answers
Hi, is there a ways to read multiple files in a single awk command?
For example:
awk -f awk_script file1 file2 file3
I've google it, most of them suggest using FNR. But I don't understand how it works. It will be a great help if someone able to explain it in simple term with some example. (4 Replies)
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9. Shell Programming and Scripting
I have 7 text files of varying sizes for each month of System Maintenance done during the 2013 calendar year (Jan. 134 jobs, Feb. 84 jobs, Apr. 594 jobs, May 158 jobs, July 69 jobs, Aug. 1 job, Oct. 102 jobs) and I have another text file which contains everything from those 7 files. Each of the... (8 Replies)
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10. UNIX for Beginners Questions & Answers
My program run without error. The problem I am having.
The program isn't outputting field values with the column headers to file.txt.
Each of the column headers in file.txt has no data.
MEMSIZE SECOND SASFoundation Filename
The output results in file.txt should show:
... (1 Reply)
Discussion started by: dellanicholson
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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)