Shell Programming and Scripting

I have server, i want to tune some storage below are my issues.

1. There is a directory

Code:

/sys/block/

There are directories starting with name emcpow* under that there is a directory queue, inside that there is file nr_requests

This is complete path

Code:

/sys/block/emcpowerbj/queue/nr_requests

i want to change all "[/sys/block/emcpow*/queue/nr_requests]" to like that

Code:

echo "100000" > /sys/block/emcpow*/queue/nr_requests

2. same thing i want to apply to all emcpow*

Code:

echo "noop" > /sys/block/emcpow*/queue/scheduler

3. another thing i want to set all emcpow* value to /dev/emcpow* to like that

Code:

blockdev --setra 16384 /dev/emcpow*

---------- Post updated at 12:19 PM ---------- Previous update was at 12:18 PM ----------

point 1 & 2 are almost same, but different is point 3. Please help me out.

The 'for' loop can do what you want.

Code:

for BLOCK in /sys/block/emcpow*
do
        echo "100000" > "$BLOCK"/queue/nr_requests
        echo "noop" > "$BLOCK"/queue/scheduler
done

#3 can be solved similarly.

will below code is fine?

Code:

for BLOCK in /dev/emcpow*

do
       blockdev --setra 16384 "$BLOCK"

done

---------- Post updated at 01:56 PM ---------- Previous update was at 01:55 PM ----------

how can i write above two codes in

1) perl
2) python

Yes, that code looks correct.

I don't see any point doing so in perl, the program would be huge and would end up running 99% shell code anyway.

I don't know Python too well.