Misc.

while true; do nc -l -p 80 -q 1 < error.html; done
while true; do { echo -e 'HTTP/1.1 200 OK\r\n'; cat index.html; } | nc -l 8080; done
python2 -m SimpleHTTPServer 8080
python3 -m http.server 8080
twistd -n web –path .
php -S localhost:8080

pandoc -s -f markdown -t html =(curl https://raw.github.com/cyberhouse/doc/master/README.md) | lynx -stdin
pandoc -s -f markdown -t html doc/README.md | lynx -stdin

curl --header 'Host: www.example.com' 'http://localhost/index.php?id=23&L=5'

curl -d @$HOME/.credentials --cookie-jar /tmp/cjar -k https://example.com/?do=login; curl -k --cookie /tmp/cjar --cookie-jar /tmp/cjar https://example.com/foo|lynx -stdin

curl -s -w "%{http_code}\\n" http://www.cyberhouse.at -o /dev/null
# Add -L if you intend to follow location responses

lsof +D /var/log

nmap -sn 172.16.35.0/24 --script ip-forwarding --script-args="target=www.google.com"

ssh server1 tcpdump -i eth3 -U -s0 -w - 'tcp port 80' | wireshark -k -w /tmp/gw.cap -b filesize:50000 -b files:10 -i -
ssh server1 'tshark -f "port !22" -w -' | wireshark -k -i -

diff .ssh/config <(ssh trillian 'cat .ssh/config')

crontab -l > /tmp/$(whoami)-crontab
echo '* * * * * www-data /var/www/html/typo3/cli_dispatch.phpsh scheduler' >> /tmp/$(whoami)-crontab
crontab /tmp/$(whoami)-crontab
rm /tmp/$(whoami)-crontab

socat TCP4-LISTEN:1234,fork TCP4:192.168.1.1:22' forwards your port   1234 to another machine's port 22. Very useful for quick NAT red

sar -o /tmp/sarlog -A 5 >/dev/null 2>&1
LANG=C; S_TIME_FORMAT="%T; sar -f /tmp/sarlog|les

chattr +i /etc/shadow; lsattr /etc/shadow
chattr -i /etc/shadow; lsattr /etc/shadow

dd if=/dev/zero of=/path/to/swapfile count=2097152 # create 1 G file
mkswap /path/to/swapfile
swapon -p 32767 /path/to/swapfile # use with lowest priority possible

Optionally create an /etc/fstab entry:

/path/to/swapfile none  swap    sw,pri=32767    0   0

Add 1 (after one blank space) or S or Single to the kernel boot parameter to start in single mode. Reset password with passwd check if SELinux is disabled if it does not work (setenforce 0). If single user mode does not work ther is an alternative: Append init=/bin/bash to the boot options, remounting the root partition is necessary (mount -o remount,rw /).

cutter 10.10.0.45

parted /dev/sda # Get the disk size first
dd if=/dev/sda | pv -s 60022480896 | pigz --fast > /media/myExternalDrive/myBackup.img

IMAGE=archlinux-2014.04.01-dual.iso && dd bs=1m if=$IMAGE | /opt/local/bin/pv -s $(wc -c $IMAGE) | dd of=/dev/disk1

tune2fs -l $(df -lh / |(read; awk '{print $1; exit}')) | grep -i created

program=httpd; strace $(ps wuax|grep $program|grep -v grep|awk '{print "-p" $2}'|xargs) -s8192 -r -o /tmp/$program-$(date +%FT%T%z)

echo 1 > /proc/sys/vm/block_dump

ps auxww | sort -nk6
# or 
ps auxww --sort +rss

ps auxwwef
# or to avoid line wraps
ps auxef

hdparm -Tt /dev/sda

stress --vm-bytes $(awk '/MemFree/{printf "%d\n", $2 * 0.9;}'< /proc/meminfo)k --vm-keep -m 1

top -b -i -d 10 >> /tmp/log/top

/bin/bash -c "echo >/dev/tcp/144.76.8.201/443 && echo 'open'"

sudo -U username -l

dstat --top-oom

remotely:

cat /usr/local/www/munin/memory-month.png | gzip -9c | uuencode /dev/stdin

locally:

pbpaste | uudecode -o /dev/stdout | gzip -cd > ~/Downloads/memory-month.png

smbutil statshares -a

dig +short myip.opendns.com @resolver1.opendns.com

curl ipinfo.io

curl ifconfig.me/all

curl icanhazip.com

curl myip.dnsomatic.com

curl whatismyip.akamai.com

vmstat 5 | awk '{system("/bin/echo -n $(/bin/date"); print ": " $0}' | tee vmstat-$(date +%F)

vmstat 5 | awk '{now=strftime("%Y-%m-%d %T "); print now $0}'

while sleep 3; do curl --silent https://wiki.sysop.cafe/misc|grep sleep && tput bel; done

while sleep 3; do dig foo.bar.baz +short @8.8.8.8|grep 129 && tput bel; done

printf '\a'
echo -en "\007"
tput bel

curl -H "Host: example.com" 10.0.0.13

wget --header="Host: example.com" 10.0.0.13

printf "John:$(openssl passwd -crypt V3Ry)\n" >> .htpasswd # this example uses crypt encryption

printf "Mary:$(openssl passwd -apr1 SEcRe7)\n" >> .htpasswd # this example uses apr1 (Apache MD5) encryption

printf "Jane:$(openssl passwd -1 V3RySEcRe7)\n" >> .htpasswd # this example uses MD5 encryption

(PASSWORD="SEcRe7PwD";SALT="$(openssl rand -base64 3)";SHA1=$(printf "$PASSWORD$SALT" | openssl dgst -binary -sha1 | xxd -ps | sed 's#$#'"`echo -n $SALT | xxd -ps`"'#' | xxd -r -ps | base64);printf "Jim:{SSHA}$SHA1\n" >> .htpasswd) # this example uses SSHA encryption

#!/usr/bin/perl
use strict;
 
chomp(my $filename=$ARGV[0]);
chomp(my $username=$ARGV[1]);
chomp(my $password=$ARGV[2]);
 
if (!$filename || !$username || !$password) {
  print "USAGE: ./crypt.pl filename username password\n\n";
} else {
  open FILE, ">>", $filename or die $!;
  print FILE $username . ":" . crypt($password, $username) . "\n";
  close FILE or die $!;
}

vim -R /var/db/mysql/percona57.err #mysql-error

e.g. to get an progress information for a running program like dd, ping, rsync'.

sed -i -e '3d' ~/.ssh/known_hosts

find /opt/tomcat/temp/ -type f -name '*.xlsx' -mtime +14 -exec rm {} \;

4  5 * * * /usr/local/bin/flock -n /tmp/backup.lock /usr/local/scripts/bbackupfoo.sh