Check apache2 enabled modules:
$ sudo apache2ctl -M Loaded Modules: core_module (static) log_config_module (static) logio_module (static) mpm_prefork_module (static) ... |
mod_rewrite (rewrite_module usually manipulated in .htaccess) and ssl (for HTTPS) for examples aren’t enabled by default in Ubuntu’ installation of apache2.
Enable one or more of them via:
$ sudo a2enmod |
Restoring a production database into VM and change date to make it looks like some point of time inside the production server i.e. in this case May 4, 2010
$ /etc/init.d/mysqld stop $ /etc/init.d/httpd stop $ date +%D -s 2010-05-04 $ date +%T -s 23:00:00 -u |
Check date
$ date Tue May 4 19:00:01 EDT 2010 |
Import database
/etc/init.d/mysqld start /etc/init.d/httpd start mysql -u some-username -p < some-db.sql |
Note: Hardware clock option in the VirtualBox VM setting is disabled
Check ssh key RSA fingerprint:
$ ssh-keygen -l -f /home/myusername/.ssh/id_rsa.pub 7b:e5:6f:a7:xx:xx:xx:xx:xx:xx:xx:xx:8b:57:xx:xx /home/myusername/.ssh/id_rsa.pub (RSA) |
Running separate version of wine in separate config directory (to isolate errors of running or installation failure)
env WINEPREFIX="/home/arif/.wine-newapps" /usr/local/bin/wine-1.1.31/usr/bin/wine /home/arif/.wine-newapps/drive_c/Program\ Files/newapps/newapps.exe |
grep omit empty lines:
cat <something> | grep -v "^$" |
I keep forgetting this regexp of “match expression at the star of the line”: the “^”
Custom run level init.d script:
startup script on run level 0 and 6, as 34th start only e.g.
update-rc.d which-tty start 34 0 6 . |
will create
/etc/rc0.d/S34which-tty /etc/rc6.d/S34which-tty |
Checking whether /dev/video0 or /dev/ttyUSB0 exists or not (module is installed & probed). They're recognized as "character special file" in bash
[ -b /dev/ttyUSB0 ] && echo "char special file found" || echo "char special file not found" |
Compare the above to "block special file"
[ -b /dev/sda ] && echo "block special file found" || echo "block special file not found" |
Socket monitoring by watching receive and send queue every 5 seconds
$ while true; do netstat -tn; sleep 5; clear; done |
Result:
Active Internet connections (w/o servers) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 10.238.133.152:43941 98.136.48.103:5050 ESTABLISHED tcp 1 0 10.238.133.152:42541 8.27.254.249:80 CLOSE_WAIT tcp 1 0 10.238.133.152:34355 184.73.222.16:80 CLOSE_WAIT tcp 0 0 10.238.133.152:43210 199.59.148.87:443 ESTABLISHED tcp 0 229 10.238.133.152:43209 199.59.148.87:443 ESTABLISHED |
This is to emulate combination of watch and ss in Solaris, more or less same result
$ watch -n 5 ss -t |
State Recv-Q Send-Q Local Address:Port Peer Address:Port ESTAB 0 0 10.238.133.152:36045 74.125.224.250:https ESTAB 0 0 10.238.133.152:36044 74.125.224.250:https CLOSE-WAIT 1 0 10.238.133.152:59622 174.129.233.179:www ESTAB 0 0 10.238.133.152:43941 98.136.48.103:mmcc CLOSE-WAIT 38 0 10.238.133.152:49300 199.59.148.87:https ESTAB 0 0 10.238.133.152:33626 74.125.224.191:https CLOSE-WAIT 1 0 10.238.133.152:37621 208.46.163.81:www |
Krusader crash giving signal 11:
1. replace .kde/share/config/krusaderrc with original one from initial installation
2. remove other files under it
When installing new, we only need to copy :
$ ls .kde/share/apps/krusader/ krusaderui.rc useractions.xml |
tcpdump default truncate to 68 bytes snapshot length (snaplen). Use -s 0 to capture all packet length
tcpdump -s 0 -w /tmp/my240.dump -i eth1 port 2000 |