Valavil RESEARCH: BLOG

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  • hack1

    December 10, 2009
  • Hacking with the “groups” GNU command

    Hacking with the “groups” GNU command

    20.4 `groups’: Print group names a user is in ============================================= `groups’ prints the names of the primary and any supplementary groups for each given USERNAME, or the current process if no names are given. If more than one name is given, the name of each user is printed before the list of that user’s groups […]

    December 8, 2009
  • groups

    Package: coreutils This package contains the basic file, shell and text manipulation utilities which are expected to exist on every operating system.

    December 8, 2009
  • true – do nothing, successfully. false – do nothing, unsuccessfully

    true – do nothing, successfully. false  – do nothing, unsuccessfully

    GNU command $true $echo $? 0 $false $echo $? 1 $ Explanation true – do nothing, successfully exit with a status code indicating success. false – do nothing, unsuccessfully exit with a status code indicating failure. Related Source Code Exposition int main (int argc, char **argv) { if (argc == 2) { initialize_main (&argc, &argv); […]

    November 29, 2009
  • true and false

    A UNIX Command $true $echo $? 0 $false $echo $? 1 $ UNIX Explanation true – do nothing, successfully exit with a status code indicating success. false – do nothing, unsuccessfully exit with a status code indicating failure. Related Source Code Exposition int main (int argc, char **argv) { if (argc == 2) { initialize_main […]

    November 29, 2009
  • true and false

    true . exit with a status code indicating success. false. exit with a status code indicating failure.

    November 29, 2009
  • dig (domain information groper )

    DNS lookup utility. contained in debian package “dnsutils”.

    November 28, 2009
  • setterm – set terminal attributes

    setterm – set terminal attributes

    GNU Command $setterm setterm: Argument error. Usage: setterm [options] Options: -term -reset -initialize -cursor -repeat -appcursorkeys -linewrap -default -foreground -background -ulcolor -ulcolor -hbcolor -hbcolor -inversescreen -bold -half-bright -blink -reverse -underline -store > -clear -tabs (tabn = 1-160) -clrtabs (tabn = 1-160) -regtabs -blank -dump -append -file dumpfilename -msg -msglevel -powersave -powerdown -blength -bfreq freqnumber -version […]

    November 24, 2009
  • setterm

    setterm sets terminal attributes.

    November 24, 2009
  • quote

    Enclosing characters in single quotes preserves the literal value of each character within the quotes.

    November 23, 2009
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