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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"
}
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"
Upload/download newer version of any file with less size and high speed.
To remake the new file use
$bspatch
It takes over 5 seconds to scan a single port on a single host using nmap
$ time (nmap -p 80 192.168.1.1 &> /dev/null)
real 0m5.109s
user 0m0.102s
sys 0m0.004s
It took netcat about 2.5 minutes to scan port 80 on the class C
$ time (for NUM in {1..255} ; do nc -w 1 -z -v 192.168.1.${NUM} 80 ; done &> /dev/null)
real 2m28.651s
user 0m0.136s
sys 0m0.341s
Using parallel, I am able to scan port 80 on the entire class C in under 2 seconds
$ time (seq 1 255 | parallel -j255 'nc -w 1 -z -v 192.168.1.{} 80' &> /dev/null)
real 0m1.957s
user 0m0.457s
sys 0m0.994s
Shows all block devices in a tree with descruptions of what they are.
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:
* $MFA_IDis ARN of the virtual MFA or serial number of the physical one
* TTL for the credentials
You need python-scapy package
Record audio to an MP3 file via ALSA. Adjust -i argument according to arecord -l output.
This loop will finish if a file hasn't changed in the last 10 seconds.
.
It checks the file's modification timestamp against the clock.
If 10 seconds have elapsed without any change to the file, then the loop ends.
.
This script will give a false positive if there's a 10 second delay between updates,
e.g. due to network congestion
.
How does it work?
'date +%s' gives the current time in seconds
'stat -c %Y' gives the file's last modification time in seconds
'$(( ))' is bash's way of doing maths
'[ X -lt 10 ]' tests the result is Less Than 10
otherwise sleep for 1 second and repeat
.
Note: Clever as this script is, inotify is smarter.
Run netstat as root (via sudo) to get the ID of the process listening on the desired socket.
Use awk to 1) match the entry that is the listening socket, 2) matching the exact port (bounded by leading colon and end of column), 3) remove the trailing slash and process name from the last column, and finally 4) use the system(…) command to call kill to terminate the process.
Two direct commands, netstat & awk, and one forked call to kill.
This does kill the specific port instead of any port that starts with 50. I consider this to be safer.
