Check These Out
omit the 1 (one) if you don't need one-per-line
Remove all commented lines
Remove all blank lines
Show the menu
Up the delay so you have enough time to select a kernel
Remove the quiet so you can watch the entire boot
Add a rootdelay for san attached storage booting
-X Send the specified command to a running screen session.
-S Option to specify the screen session if you have several screen sessions running.
$screen -ls
for listing current screens and its sessionname
You might want to secure your AWS operations requiring to use a MFA token. But then to use API or tools, you need to pass credentials generated with a MFA token.
This commands asks you for the MFA code and retrieves these credentials using AWS Cli. To print the exports, you can use:
`awk '{ print "export AWS_ACCESS_KEY_ID=\"" $1 "\"\n" "export AWS_SECRET_ACCESS_KEY=\"" $2 "\"\n" "export AWS_SESSION_TOKEN=\"" $3 "\"" }'`
You must adapt the command line to include:
* $MFA_IDis ARN of the virtual MFA or serial number of the physical one
* TTL for the credentials
man xkill
Converts any number of seconds into days, hours, minutes and seconds.
sec2dhms() {
declare -i SS="$1"
D=$(( SS / 86400 ))
H=$(( SS % 86400 / 3600 ))
M=$(( SS % 3600 / 60 ))
S=$(( SS % 60 ))
[ "$D" -gt 0 ] && echo -n "${D}:"
[ "$H" -gt 0 ] && printf "%02g:" "$H"
printf "%02g:%02g\n" "$M" "$S"
}
Explanation:
* The date command evaluated to today's date with blank padded on the left if single digit
* The grep command search and highlight today's date
* The --before-context and --after-context flags displays up to 6 lines before and after the line containing today's date; thus completes the calendar.
I have tested this command on Mac OS X Leopard and Xubuntu 8.10
I often find myself wanting to open screen on whatever command I'm currently running. Unfortunately, opening a fresh screen session spawns a new bash session, which doesn't keep my history, so calling screen directly with the previous command is the only way to go.
The ctrl+v,ctrl+m portion represents key presses that you should do. If you do it successfully you should see a ^M character appear.
Intended for dynamic ip OpenDNS users, this command will update your OpenDNS network IP.
For getting your IP, you can use one of the many one-liners here on commandlinefu.
Example:
I use this in a script which is run by kppp after it has successfully connected to my ISP:
---
#!/bin/bash
IP="`curl -s http://checkip.dyndns.org/ | grep -o '[[:digit:].]\+'`"
PW="hex-obfuscated-pw-here"
if [ "$IP" == "" ] ; then echo 'Not online.' ; exit 1
else
wget -q --user=topsecret --password="`echo $PW | xxd -ps -r`" 'https://updates.opendns.com/nic/update?hostname=myhostname&myip='"$IP" -O -
/etc/init.d/ntp-client restart &
fi
---
PS: DynDNS should use a similar method, if you know the URL, please post a comment. (Something with members.dyndns.org, if I recall correctly)
