#lang en

<<TableOfContents()>>

= File operations =
== Remove files ==
Sometimes a file starts with a dash (-), for example, you ended up with a file named "-help". (don't ask me how you did it...) Of course you can remove the higher directory, but there are other ways of removing this file:

{{{
rm -- -help
rm ./-help
}}}

== Change files ==
Change the serial of a zone file. This is for BSD.
{{{
sed -i '' 's/2020022301/2020022302/g' filename
}}}

== Extract files ==
Extract all files out of an image.
{{{
binwalk --dd='.*' file.bin
}}}

== Mount ISO partitions ==
This is a raspberry pi image:

{{{
user@wks010~/Download$ sudo parted disk.bin unit s print
Model:  (file)
Disk /home/user/Download/disk.bin: 581632s
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags: 

Number  Start   End      Size     Type     File system  Flags
 1      8192s   49151s   40960s   primary  fat16        boot, lba
 2      57344s  581631s  524288s  primary  ext2
}}}

To calculate the offset, its in this case the start value times 512, so 8192 * 512 = 4194304

{{{
user@wks010~/Download$ sudo mount -o loop,offset=4194304 /home/user/Download/disk.iso /mnt/mydisk
}}}

= List operations =
== Sort IP adresses ==
Sort a list of IP adresses.
{{{
sort -n -t . -k 1,1 -k 2,2 -k 3,3 -k 4,4
}}}
Thanks: [[https://www.madboa.com/geek/sort-addr/]]

= Processes =
== Kill processes ==
Kill your current process.
{{{
kill -9 $$
}}}

= Networking operations =
== Scan PTR records ==
Do a reverse scan of an IP range.
{{{
for i in `seq 1 254`; do host 192.168.1.$i 8.8.8.8; done |grep pointer
}}}