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[admn] commands.md

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Commands

  • tshark HTTP traffic on loopback port 8000:

    sudo tshark -i lo -V -T text -f "tcp port 8000" -d "tcp.port==8000,http" -R "http.request"

  • ffmpeg conversion for iPad:

    ffmpeg -i ${input_file} -acodec libfaac -ac 2 -ab 192k -s 1024x768 -vcodec libx264 -vprofile baseline -tune film -preset slower -b:v 1200k -f mp4 -threads 0 ${output_file}

  • sort du -h output

    du | sort -nr | cut -f2- | xargs du -hs

  • streaming tcpdump directly to a Windows Wireshark instance (untested)

    tcpdump -w - -v -i eth0 http | "c:\program files\wireshark\wireshark.exe" -k -i -"

  • Python profiling

    # Execute command with profiling
python -u -m cProfile -o profile.stats script.py arg1 arg2 --hostname blah

# Sort stats by total time spent in function
python -c "import pstats; p = pstats.Stats(\"profile.stats\"); p.sort_stats('time').print_stats(20)"

  • How to run Wireshark on Mac OS X

    Install XQuartz, install Wireshark.

    Run XQuartz via Spotlight

    Open a new Terminal, run:

    open /Applications/Wireshark.app/

    A new xterm instance opens, but Wireshark isn't visible. In the xterm instance run:

    export DISPLAY:=0

    Wireshark should now be visible.

  • Useful httrack one-liner to index a site and all 'near' non-HTML resources and all first-links away in useful directory structure.

    httrack http://www.cs.columbia.edu/~smaskey/CS6998/ -W -O "/Users/ai/websites/smaskey" --extended-parsing --mirrorlinks --structure=4 +*.pdf

  • Another httrack one liner.

    httrack "http://www.bradblock.com.s3-website-us-west-1.amazonaws.com/mll.html" --mirror-wizard --path "/home/ubuntu/websites" --near --structure=4 --sockets=1 --priority=7

  • Setting up SAMBA on RedHat

    • yum install samba samba-client

    • Replace /etc/samba/smb.conf contents with the following, replacing ${ip_address} with local IP address:

      [global]

workgroup = DCL
local master = no
preferred master = no
server string = %L Samba %v
interfaces = 127.0.0.1 ${ip_address}
socket address = ${ip_address}
log file = /var/log/samba/log.%m
max log size = 50
security = share
passdb backend = tdbsam
load printers = no
cups options = raw

[root]

comment = Root Directory
path = /
read only = no
writable = yes
printable = no
public = yes
force user = root

    • Add a root user to SAMBA by executing

      smbpasswd -a root

    • Set SAMBA to load on startup by executing:

      chkconfig smb on && chkconfig nmb on

    • Enable SAMBA by executing:

      service smb start && service nmb start

    • Browse to \\${hostname}

  • Setting up IP connectivity on a fresh RedHat install

    • Edit /etc/sysconfig/network-scripts/ifcfg-eth0 and make sure at least the following lines are present (adjust values as appropriate):

      DEVICE=eth0
BOOTPROTO=none
DNS1=172.19.1.83
DNS2=172.18.10.55
DOMAIN=datcon.co.uk
GATEWAY=10.224.0.1
IPADDR=10.224.104.2
NETMASK=255.255.0.0
ONBOOT=yes
DEFROUTE=yes

    • Assign the IP address to the Ethernet interface:

      ip addr add 10.224.104.2/16 broadcast 10.224.255.255 gateway 10.224.0.1 dev eth0

    • Add a default IP route to the default gateway:

      route add default gw 10.224.0.1 eth0

    • Turn up the Ethernet interface:

      ifconfig eth0 up

    • Set IP connectivity to enable in startup:

      chkconfig network on

  • Install latest GCC on Mac OS X

    Install homebrew.

    brew update brew tap homebrew/dupes brew install gcc --use-llvm --enable-all-languages --enable-profiled-build

  • To get GCC 4.7 working on Mac we have to force distutils to give up using -Qunused-arguments. It's painful, so we hack it real hard:

    import distutils.sysconfig for key in distutils.sysconfig._config_vars: if key in ['CONFIG_ARGS', 'PY_CFLAGS', 'CFLAGS']: distutils.sysconfig._config_vars[key] = distutils.sysconfig._config_vars[key].replace("-Qunused-arguments ", "")

  • GPG symmetric encryption and compression

    gpg --symmetric --cipher-algo "AES256" --digest-algo "SHA512" --compress-algo "BZIP2" --passphrase "password" -o test.svg.gpg test.svg

  • GPG symmetric decryption and decompression

    gpg --passphrase "password" test.svg.gpg

  • OpenSSL symmetric encryption and compression

    bzip2 --stdout -- test.svg | /usr/local/Cellar/openssl/1.0.1e/bin/openssl enc -aes-256-ctr -salt -k "password" > test.svg.openssl

  • OpenSSL symmetric decryption and decompression

    /usr/local/Cellar/openssl/1.0.1e/bin/openssl enc -aes-256-ctr -d -salt -k "password" -in test.svg.openssl | bunzip2 > test.svg.2

  • With OpenSSL 1.0.1e, AES-CBC-HMAC-SHA1 segfaults and AES-GCM always fails; they are not intended for command-line usage.

  • OpenSSL encrypt and HMAC simultaneously (pigz is a parallel gzip implementation)

    cat test.svg | pigz --best -c | /usr/local/Cellar/openssl/1.0.1e/bin/openssl enc -aes-256-ctr -salt -k "password" | tee test.svg.2 | /usr/local/Cellar/openssl/1.0.1e/bin/openssl sha256 -hmac "password"

CentOS initial setup

  • Install with "Software development workstation" selected.

  • Set up Solarized theme for gnome-terminal

    git clone git://github.com/sigurdga/gnome-terminal-colors-solarized.git cd gnome-terminal-colors-solarized

    # make it light ./solarize

    make it dark

    ./solarize

    then restart terminal

  • Set up "Oh My ZSH" with my custom theme

    curl -L https://github.com/robbyrussell/oh-my-zsh/raw/master/tools/install.sh | sh

  • Set up gvim