9 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi.
How can I create a history function? (By "read" command or so)
&
How can I configure a read command so that the arrow keys are not displayed so funny? (^[[A)
Thanks in advance. (4 Replies)
Discussion started by: sinnlosername
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2. Shell Programming and Scripting
Hi,
I am facing issues with the below:
I have a lookup file say lookup.lkp.This lookup.lkp file contains strings delimited by comma(,).
Now i want to read this command from file and execute it.
So my code below is :
Contents in the lookup.lkp file is :
c_e,m,a,`cd $BOX | ls cef_*|tail... (7 Replies)
Discussion started by: vital_parsley
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3. Shell Programming and Scripting
Hi
I am new to writing script and want to use a Bash Piped while-read and read from user input.
if something happens on server.log then do while loop or if something happend on user input then do while loop.
Pseudocode something like:
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4. Shell Programming and Scripting
Hi
i am looking a way to look at a log file(log.txt) from the last time I've read it.
However after some days the main log file(log.txt) is rename to (log.txt.1).
So now i will have two log files as below.
log.txt.1
log.txt
Now, i have to read the log from the point where i have left... (3 Replies)
Discussion started by: sumitsks
3 Replies
5. UNIX for Dummies Questions & Answers
Hello All,
i am a newbie and need some help when reading a csv file in a bourne shell script. I want to read 10 lines, then wait for a minute and then do a reading of another 10 lines and so on in the same way. I want to do this till the end of file.
Any inputs are appreciated
... (3 Replies)
Discussion started by: victor.s
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6. UNIX for Dummies Questions & Answers
hi,
this is my script #!/bin/ksh
cat temp_file.dat | while read line
do
read test
if ]; then
break
else echo "ERROR"
fi
done
when i execute this code , the script does wait for the user input . it directly prints "ERROR" and terminates after the no. of times as there... (3 Replies)
Discussion started by: siva1612
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7. Shell Programming and Scripting
Hi Guys,
Happy New Year to you all!
I have a requirement to read an embedded new-line using KSH's read builtin.
Here is what I am trying to do:
run_sql "select guestid, address, email from guest" | while read id addr email
do
## Biz logic goes here
done
I can take care of any... (6 Replies)
Discussion started by: a_programmer
6 Replies
8. Programming
# include <stdio.h>
# include <fcntl.h>
# include <stdlib.h>
# include <sys/stat.h>
int main(int argc, char *argv)
{
int fRead, fPadded, padVal;
int btRead;
int BUFFSIZE = 512;
char buff;
if (argc != 4)
{
printf ("Please provide all of the... (3 Replies)
Discussion started by: naranja18she
3 Replies
9. Shell Programming and Scripting
Can I use the read command to read the contents of a variable? I'm trying by using the following code and getting nothing back. I'm in a Linux environment.
#!/bin/ksh
IFS=~
VAR1=1~2~3~4
echo $VAR1 | read a b c d
print "$a $b $c $d" (9 Replies)
Discussion started by: nmalencia
9 Replies
tunefs(1M) tunefs(1M)
NAME
tunefs - tune up an existing HFS file system
SYNOPSIS
maxcontig] rotdelay] maxbpg] minfree]
advanced read-ahead] special-device
DESCRIPTION
The command is used to alter dynamic parameters that affect HFS file system layout policies. Parameters to be altered are specified by the
options and arguments provided on the command line as described below.
affects how the file system blocks are laid out on the disk. The default rotdelay value set by the and commands (see newfs(1M) and
mkfs(1M)) is 0 milliseconds, causing file system blocks to be written and read consecutively. In general, this should be the optimal tun-
ing, making the use of unnecessary.
Options
recognizes the following options and command-line arguments:
Set the maximum number of contiguous blocks that will be laid out
before forcing a rotational delay to maxcontig (see below). The default value is because most device drivers require
one interrupt per disk transfer. For device drivers that can chain several buffers together in a single transfer,
set maxcontig to the maximum chain length.
rotdelay is the expected time (in milliseconds) to service a transfer completion interrupt and initiate a new transfer on the
same disk. It is used to determine how much rotational spacing to place between successive blocks in a file.
maxbpg specifies the maximum number of blocks any single file can allocate out of a cylinder group before it is forced to
begin allocating blocks from another cylinder group. Typically this value is set to about one fourth of the total
blocks in a cylinder group. The intent is to prevent any single file from using up all the blocks in a single cylin-
der group, thus degrading access times for all files subsequently allocated in that cylinder group. The effect of
this limit is to cause large files to do long seeks more frequently than if they were allowed to allocate all the
blocks in a cylinder group before seeking elsewhere. For file systems with exclusively large files, this parameter
should be set higher.
minfree specifies the percentage of space that is not available to normal users; i.e., the minimum free space threshold. The
default value used is 10%. This value can be set to zero. If set to zero, throughput performance drops to as little
as one-third of the efficiency expected when the threshold is set at 10%. Note that if minfree is raised above the
current usage level, users cannot allocate files until enough files have been deleted to meet the new threshold
requirement.
Advanced read-ahead
specifies whether the file system should use an advanced predictive read-ahead algorithm. The implementation
requires more system resources in exchange for an advanced access pattern recognition. Patterns include forward
sequential, backward sequential, forward strided, and backward strided. This value can be set to zero (disable) or
one (enable). By default, a file system will have advanced read-ahead enabled when created.
(visual) Display current values
contained in the primary super-block to standard output.
(all) Modify redundant super-blocks as well as the primary super-block
as stipulated by the configuration options and arguments.
special-device is the name of the file system to be tuned. It is either a block or character special file if the file system is not
mounted, or a block special file if the file system is mounted.
WARNINGS
Root file system tuning is normally done during initial system software installation. Tuning the root file system after installation has
little useful effect because so many files have already been written.
AUTHOR
was developed by the University of California, Berkeley.
SEE ALSO
dumpfs(1M), mkfs(1M), newfs(1M).
tunefs(1M)