Burn an ISO images to CDR in Ubuntu
Answer:
Burn an ISO images to CDR in Ubuntu is as easy as the following command:
# sudo cdrecord dev=/dev/scd0 driveropts=burnfree -v -data my_file.iso
May 092010
May 052010
Display multiprocessor usage with mpstat
Answer:
To displays all the activities for the available processor(s) in your system, you can use mpstat
E.g.
# mpstat -P ALL
Linux 2.6.31-14-server (localhost) 04/30/10 _x86_64_ (1 CPU)
00:00:44 CPU %usr %nice %sys %iowait %irq %soft %steal %guest %idle
00:00:44 all 4.01 0.00 0.07 0.03 0.00 0.05 0.03 0.00 95.81
00:00:44 0 4.01 0.00 0.07 0.03 0.00 0.05 0.03 0.00 95.81
May 042010
Display process' memory usage
Answer:
To display memory usage of a process, you can use the command pmap
E.g. To show the emory usage of mysqld
# sudo pmap -d 1076
Address Kbytes Mode Offset Device Mapping
00007fddabb89000 147444 rw--- 0000000000000000 000:00000 [ anon ]
00007fddb4b86000 48 r-x-- 0000000000000000 0ca:00001 libnss_files-2.10.1.so
00007fddb4b92000 2044 ----- 000000000000c000 0ca:00001 libnss_files-2.10.1.so
00007fddb4d91000 4 r---- 000000000000b000 0ca:00001 libnss_files-2.10.1.so
00007fddb4d92000 4 rw--- 000000000000c000 0ca:00001 libnss_files-2.10.1.so
00007fddb4d93000 40 r-x-- 0000000000000000 0ca:00001 libnss_nis-2.10.1.so
00007fddb4d9d000 2044 ----- 000000000000a000 0ca:00001 libnss_nis-2.10.1.so
00007fddb4f9c000 4 r---- 0000000000009000 0ca:00001 libnss_nis-2.10.1.so
00007fddb4f9d000 4 rw--- 000000000000a000 0ca:00001 libnss_nis-2.10.1.so
00007fddb4f9e000 28 r-x-- 0000000000000000 0ca:00001 libnss_compat-2.10.1.so
00007fddb4fa5000 2048 ----- 0000000000007000 0ca:00001 libnss_compat-2.10.1.so
00007fddb51a5000 4 r---- 0000000000007000 0ca:00001 libnss_compat-2.10.1.so
00007fddb51a6000 4 rw--- 0000000000008000 0ca:00001 libnss_compat-2.10.1.so
00007fddb51a7000 4 ----- 0000000000000000 000:00000 [ anon ]
00007fddb51a8000 10240 rw--- 0000000000000000 000:00000 [ anon ]
00007fddb5ba8000 1432 r-x-- 0000000000000000 0ca:00001 libc-2.10.1.so
00007fddb5d0e000 2044 ----- 0000000000166000 0ca:00001 libc-2.10.1.so
00007fddb5f0d000 16 r---- 0000000000165000 0ca:00001 libc-2.10.1.so
00007fddb5f11000 4 rw--- 0000000000169000 0ca:00001 libc-2.10.1.so
00007fddb5f12000 20 rw--- 0000000000000000 000:00000 [ anon ]
00007fddb5f17000 88 r-x-- 0000000000000000 0ca:00001 libgcc_s.so.1
...
Apr 272010
Can I use gunzip to decompress a zip file?
Answer:
Yes, if the zipped file only contains a single member of file, not multiple.
E.g.
# gunzip < test.zip > test.txt
Apr 242010
Kill all processes accessing the a particular file/folder
Answer:
To kill all processes accessing the a particular file/folder, you can use the follow command:
# /sbin/fuser -k /data/backup
It is very useful when you want to unmount a filesystem but Linux reported the device is busy.
