Commands using gcc (17)

  • Try modifying the numbers in the "(i*(i>>8|i>>9)&46&i>>8))^(i&i>>13|i>>6)" part. Crudely stolen from http://www.xkcdb.com/9067


    10
    echo "main(i){for(i=0;;i++)putchar(((i*(i>>8|i>>9)&46&i>>8))^(i&i>>13|i>>6));}" | gcc -x c - && ./a.out | aplay
    SNDR · 2013-02-17 21:31:04 2

  • 8
    gcc -dM -E - < /dev/null
    ohe · 2009-10-28 14:13:19 1
  • outputs a f=220Hz guitar string sound (fifth string A) needs ALSA


    7
    f=220;echo "int s=16e3/$f;main(i){unsigned char v[s];read(0,v,s);for(;;)putchar(v[i%s]=(v[i%s]+v[++i%s])/2);}"|gcc -x c -&&./a.out</dev/urandom|aplay -d 2
    tehdog · 2013-06-28 14:52:53 3
  • /lib/ld-linux.so.2 is the runtime linker/loader for ELF binaries on Linux. =(cmd) is a zsh trick to take the output for the command "inside" it and save it to a temporary file. echo -e 'blah' | gcc -x c -o /dev/stdout - pipes the C source to gcc. -x c tells gcc that it's compiling C (which is required if it's reading from a pipe). -o /dev/stdout - tells it to write the binary to standard output and read the source from standard input. because of the the =() thing, the compiled output is stashed in a tempfile, which the loader then runs and executes, and the shell tosses the tempfile away immediately after running it. Show Sample Output


    6
    /lib/ld-linux.so.2 =(echo -e '#include <stdio.h>\nint main(){printf("c one liners\\n");}' | gcc -x c -o /dev/stdout -)
    mrtheplague · 2009-02-20 06:06:29 3
  • doesn't need /dev/null Show Sample Output


    4
    gcc -dM -E - <<<''
    bucciarati · 2009-10-28 14:26:56 0
  • Lists all macros and their values defined by gcc. Show Sample Output


    3
    gcc -dM -E - </dev/null
    slower · 2013-09-30 15:08:34 0

  • 2
    gcc -dM -E - < /dev/null
    lucasrangit · 2012-04-27 17:37:50 0
  • another one


    0
    echo | gcc -dM -E -
    Byung · 2011-05-09 09:59:24 0

  • 0
    for c in gcc bison dialog bc asdf; do if ! which $c >/dev/null; then echo Required program $c is missing ; exit 1; fi; done
    Mozai · 2011-06-27 12:54:02 0

  • 0
    gcc -E code.c | sed '/^\#/d' | indent -st -i2 > code-x.c
    enikulenkov · 2012-06-18 22:20:33 0
  • Something I pulled off 4chan, it plays a tune.


    0
    echo "main(i){for(i=0;;i++)putchar(((i*(i>>8|i>>9)&46&i >>8))^(i&i>>13|i>>6));}" | gcc -x c - && ./a.out | aplay
    r0nd0n · 2013-01-09 21:48:23 0
  • Install Ksuperkey one command in Kubuntu. You must manually add ksuperkey to autostart in System Settings KDE.


    0
    sudo apt-get install git gcc make libx11-dev libxtst-dev pkg-config -y && git clone https://github.com/hanschen/ksuperkey.git && cd ksuperkey && make && sudo mv ksuperkey /usr/bin/ksuperkey && cd ~ && rm -rf ksuperkey
    FadeMind · 2013-04-17 07:12:46 0

  • 0
    vim test.c && gcc -x c -o a.out test.c && ./a.out && rm a.out test.c
    ari2015 · 2013-09-08 15:09:09 0
  • This is a quick hack to make a gcc caller. Since it runs with gcc instead of tcc, it's a bit more trustworthy as far as the final answers of things go. Show Sample Output


    -3
    alias cstdin='echo "Ctrl-D when done." && gcc -Wall -o ~/.stdin.exe ~/.stdin.c && ~/.stdin.exe'
    taliver · 2009-11-19 16:38:51 1
  • It's hard to beat C. This is just slightly faster than the bc version on my machine. real 0m26.856s user 0m25.030s sys 0m0.024s Requirements: libgmp headers, gcc. Show Sample Output


    -5
    gcc -x c -o /tmp/out - -lgmp <<< '#include <stdlib.h> ... SEE SAMPLE OUTPUT FOR FULL COMMAND
    hank · 2009-09-10 02:10:46 3

  • -6
    gcc -Wall -Werror -o prog prog.c || rm -f prog.c
    devoid · 2009-02-05 17:26:51 1
  • Compile *.c files with "gcc -Wall" in actual directory, using as output file the file name without extension.


    -7
    ls *.c | while read F; do gcc -Wall -o `echo $F | cut -d . -f 1 - ` $F; done
    pichinep · 2009-08-28 13:01:56 1

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Do a search-and-replace in a file after making a backup
sed already has an option for editing files in place and making backup copies of the old file. -i will edit a file in place and if you give it an argument, it will make a backup file using that string as an extension.

Reset hosed terminal,
stty sane resets the tty to basic usable function. The ^J is a newline -- sometimes CR/LF interpretation is broken so use the ^J explicitly.

Check if you partition are aligned
To get most of you HDD/SSD driver you need to make sure you partition are aligned, if not the speed penalty can be up to 50% slower! this simple one liner will check to see if each partition start sector is divided by 512 you need to change sda with your driver if you find the one of your partitions is not aligned use gparted to move the start sector of the partition to be divided of 512

Creates a proxy based on tsocks.

save command output to image
It's just because the original command was not working on version's 6.7.7-10.

Reinstall Grub

find text in a file
this will find text in the directory you specify and give you line where it appears.

Show what PID is listening on port 80 on Linux

Calculate days on which Friday the 13th occurs (inspired from the work of the user justsomeguy)
Friday is the 5th day of the week, monday is the 1st. Output may be affected by locale.

Dump dvd from a different machine onto this one.
You can use this to directly dump from machine A (with dvd drive) to machine B (without dvd drive) . I used this to copy dvd using my friend's machine to my netbook. Above command is to be issued on machine B. Advantages : 1) No wasting time dumping first to machine A and then copying to Machine B. 2) You dont need to use space on Machine A. In fact, this will work even when Machine A doesnt have enough hdd space to dump the DVD. Use -C ssh option on slow networks (enables compression). you can replace "dd if=/dev/dvd" with any ripping command as long as it spews the iso to stdout.


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