64 bits 32 bits 16 bits 8 bits rax eax ax al rbx ebx bx bl rcx ecx cx cl rdx edx dx dl rsi esi si sil rdi edi di dil rbp ebp bp bpl rsp esp sp spl r8 r8d r8w r8b r9 r9d r9w r9b r10 r10d r10w r10b r11 r11d r11w r11b r12 r12d r12w r12b r13 r13d r13w r13b r14 r14d r14w r14b r15 r15d r15w r15b Links 64-bit syscalls 32-bit syscalls

Links Full ncurses manual Apple Secure Coding C Gibberish (Decode C declarations) Some C #define tricks Cannot find stdio.h (or other headers) Install libc6-dev Case insensitive str(n)cpy #include <strings.h> int strcasecmp(const char *s1, const char *s2); int strncasecmp(const char *s1, const char *s2, size_t n); xmalloc void *xmalloc(size_t size) { void *ptr = malloc(size); if (ptr == NULL) { fprintf(stderr, "%s: Virtual memory exhausted\n", progname); abort(); } return ptr; } xrealloc void *xrealloc(void *ptr, size_t newsize) { ptr = realloc(ptr, newsize); if (ptr == NULL) { fprintf(stderr, "%s: Virtual memory exhausted\n", progname); abort(); } return ptr; } C Operator Precedence Operator - Description - Associativity () - Parentesis - Left-To-Right [] - Brackets . - Object member -> - Object member -- ++ - Postfix increment/decrement -- ++ - Prefix increment/decrement - Right-To-Left - + - Unary plus/minus ! ~ - Logic negation/complement (type) - Cast * - Dereference & - Address sizeof - Get typesize * / % - Multiply/Divide/Modulo - Left-To-Right + - - Addition/Subtraction << >> - Bitwise shift < <= - Relation less/less or equal > >= - Relation more/more or equal == != - Relation (not) equal & - Bitwise AND ^ - Bitwise XOR | - Bitwise OR && - Logical AND || - Logical OR ?: - Ternary - Right-To-Left = - Assignment += -= - Add/Sub assignment *= /= - Mult/Div assignment %= &= - Modulo / Bitwise AND assignment ^= |= - Bitwise (X)OR <<= >>= - BITWISE SHL / SHR ASSIGNMENT

To make it easier to ssh (and enable autocomplete), create a ~/.ssh/config like this: Host * SendEnv LANG LC_* HashKnownHosts yes GSSAPIAuthentication yes PreferredAuthentications publickey,password IdentityFile ~/.ssh/id_rsa ServerAliveInterval 60 Compression yes CompressionLevel 4 Host github Hostname github.com User git and you will always use user git when you ssh to github

If you has a rsa-key and don’t want to write in your credentials every time you ssh, you can use ssh-agent instead. Add this to your .bash_profile (or make it a standalone script you execute once at startup) SSHAGENT=$(command -v ssh-agent) SSHAGENTARGS="-s" if ! pgrep -xu $USER ssh-agent &>/dev/null; then if [[ -z "$SSH_AUTH_SOCK" && -x "$SSHAGENT" ]]; then eval "$($SSHAGENT $SSHAGENTARGS)" trap "kill $SSH_AGENT_PID" 0 fi fi Then you add you credentials once by typing ssh-add (which will add ~/.ssh/id_rsa, you can also add others) and write in your password. Now ssh-agent will automatically provide the password for you for the duration of the session. ...

A small game I made in class

Go to nassh_preferences_editor.html under chrome extensions Change send-encoding from utf-8 to raw

# Global Postfix configuration file. This file lists only a subset # of all parameters. For the syntax, and for a complete parameter # list, see the postconf(5) manual page (command: "man 5 postconf"). # # For common configuration examples, see BASIC_CONFIGURATION_README # and STANDARD_CONFIGURATION_README. To find these documents, use # the command "postconf html_directory readme_directory", or go to # http://www.postfix.org/BASIC_CONFIGURATION_README.html etc. # # For best results, change no more than 2-3 parameters at a time, # and test if Postfix still works after every change. # Where is the postfix queue? queue_directory = /var/spool/postfix # Where are postXXX commands? command_directory = /usr/bin # Where are the postfix daemons? daemon_directory = /usr/lib/postfix/bin # Where is postfix-writeable data? data_directory = /var/lib/postfix # Who to run postfix as? mail_owner = postfix # What's my FQDN? myhostname = phii.iix.se # What's my domain name? mydomain = iix.se # Where are my mail sent from? myorigin = $mydomain # Which interfaces to I listen on? inet_interfaces = all # I think this is to which target's I email? mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain # How I reject mail (550 = reject mail, 450 = try again later) unknown_local_recipient_reject_code = 550 # Who do I trust? (I think this is forwarding or something) mynetworks_style = host # If you change the alias database, run "postalias /etc/aliases" (or # wherever your system stores the mail alias file), or simply run # "newaliases" to build the necessary DBM or DB file. # # It will take a minute or so before changes become visible. Use # "postfix reload" to eliminate the delay. alias_maps = hash:/etc/postfix/aliases # The alias_database parameter specifies the alias database(s) that # are built with "newaliases" or "sendmail -bi". This is a separate # configuration parameter, because alias_maps (see above) may specify # tables that are not necessarily all under control by Postfix. # What does this mean? Your guess is as good as mine alias_database = $alias_maps # Allow email tags # See canonical(5) local(8), relocated(5) and virtual(5) for effects recipient_delimiter = + # Debug level debug_peer_level = 2 # The debugger_command specifies the external command that is executed # when a Postfix daemon program is run with the -D option. # # Use "command .. & sleep 5" so that the debugger can attach before # the process marches on. If you use an X-based debugger, be sure to # set up your XAUTHORITY environment variable before starting Postfix. # debugger_command = PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin ddd $daemon_directory/$process_name $process_id & sleep 5 # If you can't use X, use this to capture the call stack when a # daemon crashes. The result is in a file in the configuration # directory, and is named after the process name and the process ID. # # debugger_command = # PATH=/bin:/usr/bin:/usr/local/bin; export PATH; (echo cont; # echo where) | gdb $daemon_directory/$process_name $process_id 2>&1 # >$config_directory/$process_name.$process_id.log & sleep 5 # # The full pathname of the Postfix sendmail command. sendmail_path = /usr/bin/sendmail # The full pathname of the Postfix newaliases command. newaliases_path = /usr/bin/newaliases # The full pathname of the Postfix mailq command. mailq_path = /usr/bin/mailq # setgid_group: The group for mail submission and queue management # commands. This must be a group name with a numerical group ID that # is not shared with other accounts, not even with the Postfix account. # setgid_group = postdrop # html_directory: The location of the Postfix HTML documentation. html_directory = no # manpage_directory: The location of the Postfix on-line manual pages. manpage_directory = /usr/share/man # sample_directory: The location of the Postfix sample configuration files. # This parameter is obsolete as of Postfix 2.1. but it feels nice to keep it sample_directory = /etc/postfix/sample # readme_directory: The location of the Postfix README files. readme_directory = /usr/share/doc/postfix # Protocol to use (I only have ipv4 so I can deploy it everywhere) inet_protocols = ipv4 ## Make sure we look in /etc/hosts first lmtp_host_lookup = native smtp_host_lookup = native # Fix issue with smtpd not finding certs smtpd_tls_CAfile = /etc/ssl/certs/ca-certificates.crt smtpd_tls_cert_file = /etc/postfix/ssl/newcert.pem smtpd_tls_key_file = /etc/postfix/ssl/privkey.key # Do I still need this? Yes? No? Maybe? compatibility_level = 2

A small game I made in class

If you found this page through Google, it would be stupid to follow these instructions to the letter This kernel requires the following features not present on the CPU: pae Unable to boot - please use a kernel appropriate for your CPU. Step 1: Chroot mount /dev/sda2 /mnt for i in dev proc sys; do mount --bind /$i /mnt/$i; done chroot /mnt Step 2: Make initrd cd /boot mkinitrd -c -k 3.2.45 -m ext2 -f ext2 -r /dev/sda2 Step 3: Add to lilo echo >>/etc/lilo.conf <<EOF # Linux bootable partition config begins image = /boot/vmlinuz-generic-3.2.45 initrd = /boot/initrd.gz root = /dev/sda2 label = Slacky-3.2.45-initrd read-only # Linux bootable partition config ends EOF Step 4: Update lilo and reboot lilo exit umount /mnt/{dev,proc,sys,} reboot

These instructions are old and probably don’t work anymore Add spotify-sources to apt-repo echo "deb http://repository.spotify.com stable non-free" >> /etc/apt/sources.list Add key apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 94558F59 Fetch updates apt-get update Add this stupid old dependency This might not be needed anymore / on other distros. Just do it if the next step doesn’t work wget snapshot.debian.org/archive/debian/20110406T213352Z/pool/main/o/openssl098/libssl0.9.8_0.9.8o-6_amd64.deb dpkg -i libssl0.9.8_0.9.8o-6_amd64.deb Install spotify apt-get install spotify-client Run spotify! ...