Unix ps command – Long Process Listing
| Posted by watashii | Filed under Programming, UnixWhen viewing full process listings with ps -ef command, sometimes the command name is too long and gets chopped off at the end of the screen. This command name has a limit of 80 characters.
netcool@sun61 [/opt/netcool] 688 % ps -ef|grep 6176 netcool 6176 1 0 Sep 12 ? 31:55 /opt/netcool/platform/solaris2/jre_1.5.0/bin/java -Xmx1024m -Xms256m -Djava.awt
So how can we show the entire command? The solution is to use the /usr/ucb/ps -auxxwww command:
netcool@sun61 [/opt/netcool] 689 % /usr/ucb/ps -auxxwww|grep -i 6176 netcool 6176 0.1 10.5610440428552 ? R Sep 12 31:55 /opt/netcool/platform/solaris2/jre_1.5.0/bin/java -Xmx1024m -Xms256m -Djava.awt.headless=true -Dnchome=/opt/netcool -Dngfhome=/opt/netcool/guifoundation -Dfile.encoding=UTF-8 -Dsun.jnu.encoding=UTF-8 -Dbase.directory=/opt/netcool -Dsm.props.directory=/opt/netcool/etc/sm -Djava.security.auth.login.config=/opt/netcool/guifoundation/conf/mach_jaas.config -Djava.endorsed.dirs=/opt/netcool/guifoundation/common/endorsed -classpath /opt/netcool/platform/solaris2/jre_1.5.0/lib/tools.jar:/opt/netcool/guifoundation/bin/bootstrap.jar -Dcatalina.base=/opt/netcool/guifoundation -Dcatalina.home=/opt/netcool/guifoundation -Djava.io.tmpdir=/opt/netcool/guifoundation/temp org.apache.catalina.startup.Bootstrap start
UNIX file size listing – du command
| Posted by watashii | Filed under Programming, Unix
Question: How can I list the true file and directory sizes on UNIX?
boadmin@nshost1>$ ls -la
total 12130522
drwxr-xr-x 5 boadmin boadmin 512 Aug 4 14:30 .
drwxr-xr-x 31 boadmin boadmin 1024 Aug 1 22:00 ..
drwxr-xr-x 5 boadmin boadmin 512 May 7 05:48 DISK_1
drwxr-xr-x 3 boadmin boadmin 512 May 7 05:47 DISK_2
drwxr-xr-x 3 boadmin boadmin 512 May 31 14:02 sp3
-rw-r--r-- 1 boadmin boadmin 6207767040 Aug 4 14:33 sp3.tarTags: directory size, du, file size, size listing, unix
Unix – Creating Cron Jobs with Crontab
| Posted by watashii | Filed under Programming, UnixCron is a Unix (*nix) utility for scheduling tasks to run in the background. These are known as cron jobs. A crontab is basically a text file (cron table) containing a list of commands to be run, under the current logged-in user.
- Commands
crontab -e # Edit (or create) the crontab file
crontab -l # View the crontab file
crontab -r # Remove the crontab file - Restrictions
Crontab access is controlled with a cron.allow and a cron.deny file, listing the associated usernames. If cron.deny exists, and cron.allow is missing, all users can use crontab. If both missing then only root is allowed.
whereis cron - Crontab file syntax
The syntax contains 5 fields specifying the scheduling datetime values, and the last portion contains the Unix command to run.
# +---------------- minute (0 - 59)
# | +------------- hour (0 - 23)
# | | +---------- day of month (1 - 31)
# | | | +------- month (1 - 12)
# | | | | +---- day of week (0 - 7) (Sunday=0 or 7)
# | | | | |
* * * * * command to be executed
On each of the 5 fields, 3 operators can be used to specify the datetime selection.
# Comma (',') specifies a list of values, eg: "1,3,4,7"
# Dash ('-') specifies a range, eg: "1-3" or "1,2,3"
# Asterisk ('*') specifies all possible values for a field. - Crontab file example
The following job lists the tmp directory structure and appends the output to a log file every minute.
0-59 * * * * ls -la /tmp >> /tmp/log.txt
