jpegoptim Flags

jpegoptim -help
jpegoptim v1.4.4 Copyright (c) 1996-2016, Timo Kokkonen
Usage: jpegoptim [options]

-d, --dest= specify alternative destination directory for
optimized files (default is to overwrite originals)
-f, --force force optimization
-h, --help display this help and exit
-m, --max=
set maximum image quality factor (disables lossless
optimization mode, which is by default on)
Valid quality values: 0 - 100
-n, --noaction don't really optimize files, just print results
-S, --size=
Try to optimize file to given size (disables lossless
optimization mode). Target size is specified either in
kilo bytes (1 - n) or as percentage (1% - 99%)
-T, --threshold= keep old file if the gain is below a threshold (%)
-b, --csv print progress info in CSV format
-o, --overwrite overwrite target file even if it exists (meaningful
only when used with -d, --dest option)
-p, --preserve preserve file timestamps
-P, --preserve-perms
preserve original file permissions by overwriting it
-q, --quiet quiet mode
-t, --totals print totals after processing all files
-v, --verbose enable verbose mode (positively chatty)
-V, --version print program version

-s, --strip-all strip all markers from output file
--strip-none do not strip any markers
--strip-com strip Comment markers from output file
--strip-exif strip Exif markers from output file
--strip-iptc strip IPTC/Photoshop (APP13) markers from output file
--strip-icc strip ICC profile markers from output file
--strip-xmp strip XMP markers markers from output file

--all-normal force all output files to be non-progressive
--all-progressive force all output files to be progressive
--stdout send output to standard output (instead of a file)
--stdin read input from standard input (instead of a file)

Program Documentation is a documentation hosting platform specializing in windows documentation files. By converting “.chm” windows help files into html format, they become viewable and searchable on the web so programming questions can be answered more easily. contains a wide variety of help documentation from late 90s help files from pre-Windows XP computers to the latest Python documentation.

ulimit flags, commands, and help

help ulimit
ulimit: ulimit [-SHacdefilmnpqrstuvx] [limit]
Modify shell resource limits.

Provides control over the resources available to the shell and processes
it creates, on systems that allow such control.

-S use the `soft' resource limit
-H use the `hard' resource limit
-a all current limits are reported
-b the socket buffer size
-c the maximum size of core files created
-d the maximum size of a process's data segment
-e the maximum scheduling priority (`nice')
-f the maximum size of files written by the shell and its children
-i the maximum number of pending signals
-l the maximum size a process may lock into memory
-m the maximum resident set size
-n the maximum number of open file descriptors
-p the pipe buffer size
-q the maximum number of bytes in POSIX message queues
-r the maximum real-time scheduling priority
-s the maximum stack size
-t the maximum amount of cpu time in seconds
-u the maximum number of user processes
-v the size of virtual memory
-x the maximum number of file locks

If LIMIT is given, it is the new value of the specified resource; the
special LIMIT values `soft', `hard', and `unlimited' stand for the
current soft limit, the current hard limit, and no limit, respectively.
Otherwise, the current value of the specified resource is printed. If
no option is given, then -f is assumed.

Values are in 1024-byte increments, except for -t, which is in seconds,
-p, which is in increments of 512 bytes, and -u, which is an unscaled
number of processes.

Exit Status:
Returns success unless an invalid option is supplied or an error occurs.

Better Key Rates – OSX

Set better keyboard repeat rates with the following commands in terminal. Before running the commands set your Key Repeat and Delay Until Repeat to the fastest options (System Preferences->Keyboard).

#disable special characters when holding keys
defaults write NSGlobalDomain ApplePressAndHoldEnabled -bool false

# normal minimum is 15 (225 ms)
defaults write -g InitialKeyRepeat -float 10.0
defaults write NSGlobalDomain InitialKeyRepeat -float 10.0

# normal minimum is 2 (30 ms)
defaults write NSGlobalDomain KeyRepeat -float 1.0
defaults write -g KeyRepeat -float 1.0

Log out and back in and your keys will be blazing fast. Don’t set them too low or you will have trouble using your keyboard to type in your password (trust me, I tried super low values and almost got locked out). If you re-open or adjust your keyboard settings from the system preferences menu, you may have to re-run these commands (so keep this post handy!)

Change Mac Address of Network Cards in OSX

Give yourself a fresh mac address.

  1. Generate a random valid MAC: openssl rand -hex 6 | sed 's/\(..\)/\1:/g; s/.$//'
  2. Set it: sudo ifconfig en0 ether 00:00:00:00:00:00

Obviously you’ll need to replace 00:00:00:00:00:00 with your generated mac address. Don’t mind the openssl error “unable to write ‘random state'”. It worked just fine.

cpuminer help – Usage, Flags and Command Examples

Example Command for Monero Mining (XMR):

./cpuminer -a cryptonight -o stratum+tcp:// -u 48JvicghZt266rgdFvMAAc4yBmRF4FwZecztBKJwQXLJdFkHnD3hetiDwcXGRyScGWgh3D8YoTTwoSx4HCKAoFQf3iQbXd6 -p x

cpuminer –help


./cpuminer --help
** cpuminer-multi 1.3.3 by [email protected] **
BTC donation address: 1FhDPLPpw18X4srecguG3MxJYe4a1JsZnd (tpruvot)
Usage: cpuminer-multi [OPTIONS]
  -a, --algo=ALGO       specify the algorithm to use
                          axiom        Shabal-256 MemoHash
                          bitcore      Timetravel with 10 algos
                          blake        Blake-256 14-rounds (SFR)
                          blakecoin    Blake-256 single sha256 merkle
                          blake2s      Blake2-S (256)
                          bmw          BMW 256
                          c11/flax     C11
                          cryptolight  Cryptonight-light
                          cryptonight  Monero
                          decred       Blake-256 14-rounds 180 bytes
                          dmd-gr       Diamond-Groestl
                          drop         Dropcoin
                          fresh        Fresh
                          groestl      GroestlCoin
                          heavy        Heavy
                          jha          JHA
                          keccak       Keccak
                          luffa        Luffa
                          lyra2re      Lyra2RE
                          lyra2rev2    Lyra2REv2 (Vertcoin)
                          myr-gr       Myriad-Groestl
                          neoscrypt    NeoScrypt(128, 2, 1)
                          nist5        Nist5
                          pluck        Pluck:128 (Supcoin)
                          pentablake   Pentablake
                          quark        Quark
                          qubit        Qubit
                          scrypt       scrypt(1024, 1, 1) (default)
                          scrypt:N     scrypt(N, 1, 1)
                          scrypt-jane:N (with N factor from 4 to 30)
      --cert=FILE       certificate for mining server using SSL
                          shavite3     Shavite3
                          sha256d      SHA-256d
                          sia          Blake2-B
                          sib          X11 + gost (SibCoin)
                          skein        Skein+Sha (Skeincoin)
                          skein2       Double Skein (Woodcoin)
                          s3           S3
                          timetravel   Timetravel (Machinecoin)
                          vanilla      Blake-256 8-rounds
                          x11evo       Permuted x11
                          x11          X11
                          x13          X13
                          x14          X14
                          x15          X15
                          x17          X17
                          xevan        Xevan (BitSend)
                          yescrypt     Yescrypt
                          zr5          ZR5
  -o, --url=URL         URL of mining server
  -O, --userpass=U:P    username:password pair for mining server
  -u, --user=USERNAME   username for mining server
  -p, --pass=PASSWORD   password for mining server
      --cert=FILE       certificate for mining server using SSL
  -x, --proxy=[PROTOCOL://]HOST[:PORT]  connect through a proxy
  -t, --threads=N       number of miner threads (default: number of processors)
  -r, --retries=N       number of times to retry if a network call fails
                          (default: retry indefinitely)
  -R, --retry-pause=N   time to pause between retries, in seconds (default: 30)
      --time-limit=N    maximum time [s] to mine before exiting the program.
  -T, --timeout=N       timeout for long poll and stratum (default: 300 seconds)
  -s, --scantime=N      upper bound on time spent scanning current work when
                          long polling is unavailable, in seconds (default: 5)
      --randomize       Randomize scan range start to reduce duplicates
  -f, --diff-factor     Divide req. difficulty by this factor (std is 1.0)
  -m, --diff-multiplier Multiply difficulty by this factor (std is 1.0)
  -n, --nfactor         neoscrypt N-Factor
      --coinbase-addr=ADDR  payout address for solo mining
      --coinbase-sig=TEXT  data to insert in the coinbase when possible
      --max-log-rate    limit per-core hashrate logs (default: 5s)
      --no-longpoll     disable long polling support
      --no-getwork      disable getwork support
      --no-gbt          disable getblocktemplate support
      --no-stratum      disable X-Stratum support
      --no-extranonce   disable Stratum extranonce support
      --no-redirect     ignore requests to change the URL of the mining server
  -q, --quiet           disable per-thread hashmeter output
      --no-color        disable colored output
  -D, --debug           enable debug output
  -P, --protocol-dump   verbose dump of protocol-level activities
      --hide-diff       Hide submitted block and net difficulty
  -S, --syslog          use system log for output messages
  -B, --background      run the miner in the background
      --benchmark       run in offline benchmark mode
      --cputest         debug hashes from cpu algorithms
      --cpu-affinity    set process affinity to cpu core(s), mask 0x3 for cores 0 and 1
      --cpu-priority    set process priority (default: 0 idle, 2 normal to 5 highest)
  -b, --api-bind        IP/Port for the miner API (default:
      --api-remote      Allow remote control
      --max-temp=N      Only mine if cpu temp is less than specified value (linux)
      --max-rate=N[KMG] Only mine if net hashrate is less than specified value
      --max-diff=N      Only mine if net difficulty is less than specified value
  -c, --config=FILE     load a JSON-format configuration file
  -V, --version         display version information and exit
  -h, --help            display this help text and exit