Blog

[ ÚJ BEJEGYZÉS ]   [ ÚJ CIKK ]

• Linux programok - kedvcsináló

  Smem - selenic.com/smem
  Memory usage calculator

  Install: sudo apt-get install smem

  A memória felhasználás egyike a könnyen félreértelmezhető topicoknak.
  Kezdetekben amig nem létezett a Multi task és a dinamic link library (dll), shared library és igy tovább...
  a valós RAM felhasználás kiszámitása lényegesen egyszerűbb volt.
  A legegyszerűbben a top paranccsal kérdezhetjük le az aktuális RAM fogyasztást amit a RES (resident set size) oszlop mutat.
  RES - mennyi fizikai memória lett lefoglalva, viszont a közös library-k igy akár többször is beleszámolódhatnak a memória felhasználásba.
  Ezzel szemben az smem képes kezelni a shared program részeket és ezáltal valósabb képet ad. Ezt a módot hivják resident set size -nak, röviden RSS.
  smem - alap információk (hasonlóan,mint a top)
  smem -m - library-oriented nézet
  smem -u - user oriented nézet
  smem -t -p - teljes felhasználás százalékos eloszlásban
  smem -c "name user pss" - oszlopokba rendezve
  smem -s rss -r - Sort by reverse RSS
  smem -M libxml - Show processes filtered by mapping
  smem -m -P [e]volution - Show mappings filtered by process
  smem --pie name -s rss - Show a pie chart of RSS labeled by name

  Folytatás...

  sonar 11 éve 0

• Howto: Backup and restore your Linux system

  1: Backing-up

  To do this, become root with
  sudo su
  and go to the root of your filesystem
  cd /
  Now, below is the full command I would use to make a backup of my system:
  tar cvpzf backup.tgz --exclude=/proc --exclude=/lost+found --exclude=/backup.tgz --exclude=/mnt --exclude=/sys /
  'cvpfz' are the options we give to tar, like 'create archive' (obviously),
  'preserve permissions'(to keep the same permissions on everything the same), and 'gzip' to keep the size down.
  Next, the name the archive is going to get. backup.tgz in our example.
  Next comes the root of the directory we want to backup. Since we want to backup everything; /

  tar zcvf backup.tgz --one-file-system /
  Mounted folders wont be part of the backup. Easier than previous method.

  2: Restoring

  tar xvpfz backup.tgz -C /
  WARNING: this will overwrite every single file on your partition with the one in the archive!
  Create the excluded folders
  mkdir proc
  mkdir lost+found
  mkdir mnt
  mkdir sys
  etc...

  sonar 11 éve 1

• tftpd.remap -- TFTP Daemon Path Remapping

  #
  # tftpd.remap -- TFTP Daemon Path Remapping
  #
  # This file has three fields: operation, regex, remapping
  #
  # The operation is a combination of the following letters:
  #
  # r - rewrite the matched string with the remapping pattern
  # i - case-insensitive matching
  # g - repeat until no match (used with "r")
  # e - exit (with success) if we match this pattern, do not process
  # subsequent rules
  # s - start over from the first rule if we match this pattern
  # a - abort (refuse the request) if we match this rule
  # G - this rule applies to TFTP GET requests only
  # P - this rule applies to TFTP PUT requests only
  #
  # The regex is a regular expression in the style of egrep(1).
  #
  # The remapping is a pattern, all characters are verbatim except \
  # \0 copies the full string that matched the regex
  # \1..\9 copies the 9 first (..) expressions in the regex
  # \\ is an escaped \
  #
  # "#" begins a comment, unless \-escaped
  #
  ri ^[a-z]: # Remove drive letters
  rg \\ / # Convert backslashes to slashes
  rg \# @ # Convert hash marks to @ signs
  rg /../ /..no../ # Convert /../ to /..no../
  e ^incoming/ # These are always ok
  r ^[^/] /\0 # Convert nonabsolute files
  a ^\. # Reject requests for hidden files

  sonar 11 éve 0

• Linux parancsgyűjteményem 2

  1. Get Internal IP Address(es) on Linux Shell / Command Line

  1.1 Get Single IP Address by Interface

  Returns plain IP address.
  ## Example usage ##
  /sbin/ifconfig eth0 | grep "inet addr" | awk -F: '{print $2}' | awk '{print $1}'
  10.20.10.1

  Create simple bash function (example int-ip) with following command.

  function int-ip { /sbin/ifconfig $1 | grep "inet addr" | awk -F: '{print $2}' | awk '{print $1}'; }

  ## Example usage ##
  int-ip eth0
  10.20.10.1

  1.2 Get Every Interfaces IP Address

  Returns every interface and IP address pairs.

  /sbin/ifconfig |grep -B1 "inet addr" |awk '{ if ( $1 == "inet" ) { print $2 } else if ( $2 == "Link" ) { printf "%s:" ,$1 } }' |awk -F: '{ print $1 ": " $3 }'

  ## Example output ##
  eth0: 10.20.10.1
  eth1: 10.20.1.168
  lo: 127.0.0.1

  Create simple bash function (example int-ips) with following command.

  Folytatás...

  sonar 11 éve 0

• raspberry pi

  Image to SD
  1. sha1sum ~/2012-12-16-wheezy-raspbian.zip
  2. unzip ~/2012-12-16-wheezy-raspbian.zip
  3. Run df -h to see what devices are currently mounted -> note which is the SD card
  4. umount /dev/mmcblk0p1
  5. dd bs=4M if=~/2012-12-16-wheezy-raspbian.img of=/dev/mmcblk0

  sonar 11 éve 0