Commands using gcc

Commands using gcc (17)

sorted by

List of macros defined by gcc

Lists all macros and their values defined by gcc. Show Sample Output

gcc -dM -E - </dev/null

slower · 2013-09-30 15:08:34 0

Quickly write and run a C program.
This is sample output - yours may be different.
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
guitar synthesizer in one line of C

outputs a f=220Hz guitar string sound (fifth string A) needs ALSA
This is sample output - yours may be different.
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 2
Installation Ksuperkey by one command in Kubuntu.

Install Ksuperkey one command in Kubuntu. You must manually add ksuperkey to autostart in System Settings KDE.
This is sample output - yours may be different.
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
Play awesome rythmic noise using aplay

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
This is sample output - yours may be different.
9

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
Useless fun

Something I pulled off 4chan, it plays a tune.
This is sample output - yours may be different.
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
Apply only preprocessor for .c file and beautify output
This is sample output - yours may be different.
0

gcc -E code.c | sed '/^\#/d' | indent -st -i2 > code-x.c

enikulenkov · 2012-06-18 22:20:33 0

See a full list of compiler defined symbols

From http://lists.debian.org/debian-devel/2001/01/msg00971.html . Show Sample Output

This is sample output - yours may be different.

#define __DBL_MIN_EXP__ (-1021)
#define __UINT_LEAST16_MAX__ 65535
#define __FLT_MIN__ 1.17549435082228750796873653722225e-38F
#define __UINT_LEAST8_TYPE__ unsigned char
#define __INTMAX_C(c) c ## LL
#define __CS_SOURCERYGXX_REV__ 55
#define __CHAR_BIT__ 8
#define _ARCH_PPCGR 1
#define __UINT8_MAX__ 255
#define __WINT_MAX__ 4294967295U
#define __SIZE_MAX__ 4294967295U
#define __WCHAR_MAX__ 2147483647L
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_1 1
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2 1
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4 1
#define __DBL_DENORM_MIN__ ((double)4.94065645841246544176568792868221e-324L)
#define __FLT_EVAL_METHOD__ 0
#define __unix__ 1
#define __UINT_FAST64_MAX__ 18446744073709551615ULL
#define __SIG_ATOMIC_TYPE__ int
#define __DBL_MIN_10_EXP__ (-307)
#define __FINITE_MATH_ONLY__ 0
#define __GNUC_PATCHLEVEL__ 1
#define __UINT_FAST8_MAX__ 255
#define __DEC64_MAX_EXP__ 385
#define __INT8_C(c) c
#define __UINT_LEAST64_MAX__ 18446744073709551615ULL
#define __SHRT_MAX__ 32767
#define __LDBL_MAX__ 1.79769313486231580793728971405301e+308L
#define __UINT_LEAST8_MAX__ 255
#define _ARCH_PPC 1
#define __UINTMAX_TYPE__ long long unsigned int
#define __linux 1
#define __DEC32_EPSILON__ 1E-6DF
#define __CHAR_UNSIGNED__ 1
#define __UINT32_MAX__ 4294967295U
#define __LDBL_MAX_EXP__ 1024
#define __WINT_MIN__ 0U
#define __linux__ 1
#define __SCHAR_MAX__ 127
#define __WCHAR_MIN__ (-__WCHAR_MAX__ - 1)
#define __INT64_C(c) c ## LL
#define __DBL_DIG__ 15
#define __SIZEOF_INT__ 4
#define __SIZEOF_POINTER__ 4
#define __USER_LABEL_PREFIX__ 
#define __STDC_HOSTED__ 1
#define __LDBL_HAS_INFINITY__ 1
#define __FLT_EPSILON__ 1.19209289550781250000000000000000e-7F
#define _CALL_SYSV 1
#define __LDBL_MIN__ 2.00416836000897277799610805135016e-292L
#define __DEC32_MAX__ 9.999999E96DF
#define __INT32_MAX__ 2147483647
#define __SIZEOF_LONG__ 4
#define __UINT16_C(c) c
#define __DECIMAL_DIG__ 33
#define __gnu_linux__ 1
#define __LDBL_HAS_QUIET_NAN__ 1
#define __GNUC__ 4
#define __FLT_HAS_DENORM__ 1
#define __SIZEOF_LONG_DOUBLE__ 16
#define __BIGGEST_ALIGNMENT__ 16
#define __DBL_MAX__ ((double)1.79769313486231570814527423731704e+308L)
#define __INT_FAST32_MAX__ 2147483647
#define __DBL_HAS_INFINITY__ 1
#define __DEC32_MIN_EXP__ (-94)
#define __INT_FAST16_TYPE__ int
#define __LDBL_HAS_DENORM__ 1
#define __DEC128_MAX__ 9.999999999999999999999999999999999E6144DL
#define __INT_LEAST32_MAX__ 2147483647
#define __DEC32_MIN__ 1E-95DF
#define __DBL_MAX_EXP__ 1024
#define __DEC128_EPSILON__ 1E-33DL
#define __PTRDIFF_MAX__ 2147483647
#define __LONG_LONG_MAX__ 9223372036854775807LL
#define __SIZEOF_SIZE_T__ 4
#define __PPC__ 1
#define __SIZEOF_WINT_T__ 4
#define __GXX_ABI_VERSION 1002
#define __FLT_MIN_EXP__ (-125)
#define __INT_FAST64_TYPE__ long long int
#define __DBL_MIN__ ((double)2.22507385850720138309023271733240e-308L)
#define __LONGDOUBLE128 1
#define __DEC128_MIN__ 1E-6143DL
#define __REGISTER_PREFIX__ 
#define __UINT16_MAX__ 65535
#define __DBL_HAS_DENORM__ 1
#define __UINT8_TYPE__ unsigned char
#define __NO_INLINE__ 1
#define __FLT_MANT_DIG__ 24
#define __VERSION__ "4.5.1"
#define __UINT64_C(c) c ## ULL
#define __BIG_ENDIAN__ 1
#define __INT32_C(c) c
#define __DEC64_EPSILON__ 1E-15DD
#define __DEC128_MIN_EXP__ (-6142)
#define __INT_FAST32_TYPE__ int
#define __powerpc__ 1
#define __UINT_LEAST16_TYPE__ short unsigned int
#define unix 1
#define __INT16_MAX__ 32767
#define __SIZE_TYPE__ unsigned int
#define __UINT64_MAX__ 18446744073709551615ULL
#define __INT8_TYPE__ signed char
#define __ELF__ 1
#define __HAVE_BSWAP__ 1
#define __FLT_RADIX__ 2
#define __INT_LEAST16_TYPE__ short int
#define __LDBL_EPSILON__ 4.94065645841246544176568792868221e-324L
#define __UINTMAX_C(c) c ## ULL
#define __SIG_ATOMIC_MAX__ 2147483647
#define __SIZEOF_PTRDIFF_T__ 4
#define __CS_SOURCERYGXX_MIN__ 9
#define __DEC32_SUBNORMAL_MIN__ 0.000001E-95DF
#define __INT_FAST16_MAX__ 2147483647
#define __UINT_FAST32_MAX__ 4294967295U
#define __UINT_LEAST64_TYPE__ long long unsigned int
#define __FLT_HAS_QUIET_NAN__ 1
#define __FLT_MAX_10_EXP__ 38
#define __LONG_MAX__ 2147483647L
#define __DEC128_SUBNORMAL_MIN__ 0.000000000000000000000000000000001E-6143DL
#define __FLT_HAS_INFINITY__ 1
#define __unix 1
#define __UINT_FAST16_TYPE__ unsigned int
#define __DEC64_MAX__ 9.999999999999999E384DD
#define __CHAR16_TYPE__ short unsigned int
#define __PRAGMA_REDEFINE_EXTNAME 1
#define __CS_SOURCERYGXX_MAJ__ 2010
#define __INT_LEAST16_MAX__ 32767
#define __DEC64_MANT_DIG__ 16
#define __INT64_MAX__ 9223372036854775807LL
#define __UINT_LEAST32_MAX__ 4294967295U
#define __INT_LEAST64_TYPE__ long long int
#define __INT16_TYPE__ short int
#define __INT_LEAST8_TYPE__ signed char
#define __DEC32_MAX_EXP__ 97
#define _BIG_ENDIAN 1
#define __INT_FAST8_MAX__ 127
#define __INTPTR_MAX__ 2147483647
#define linux 1
#define __PPC 1
#define __LDBL_MANT_DIG__ 106
#define __DBL_HAS_QUIET_NAN__ 1
#define __SIG_ATOMIC_MIN__ (-__SIG_ATOMIC_MAX__ - 1)
#define __INTPTR_TYPE__ int
#define __UINT16_TYPE__ short unsigned int
#define __WCHAR_TYPE__ long int
#define __SIZEOF_FLOAT__ 4
#define __UINTPTR_MAX__ 4294967295U
#define __DEC64_MIN_EXP__ (-382)
#define __INT_FAST64_MAX__ 9223372036854775807LL
#define __FLT_DIG__ 6
#define __powerpc 1
#define __UINT_FAST64_TYPE__ long long unsigned int
#define __INT_MAX__ 2147483647
#define __LONG_DOUBLE_128__ 1
#define __INT64_TYPE__ long long int
#define __FLT_MAX_EXP__ 128
#define __DBL_MANT_DIG__ 53
#define __INT_LEAST64_MAX__ 9223372036854775807LL
#define __DEC64_MIN__ 1E-383DD
#define __WINT_TYPE__ unsigned int
#define __UINT_LEAST32_TYPE__ unsigned int
#define __SIZEOF_SHORT__ 2
#define __LDBL_MIN_EXP__ (-968)
#define __INT_LEAST8_MAX__ 127
#define __LDBL_MAX_10_EXP__ 308
#define __DBL_EPSILON__ ((double)2.22044604925031308084726333618164e-16L)
#define __UINT8_C(c) c
#define PPC 1
#define __INT_LEAST32_TYPE__ int
#define __SIZEOF_WCHAR_T__ 4
#define __UINT64_TYPE__ long long unsigned int
#define __INT_FAST8_TYPE__ signed char
#define __DEC_EVAL_METHOD__ 2
#define powerpc 1
#define __UINT32_C(c) c ## U
#define __INTMAX_MAX__ 9223372036854775807LL
#define __FLT_DENORM_MIN__ 1.40129846432481707092372958328992e-45F
#define __INT8_MAX__ 127
#define __UINT_FAST32_TYPE__ unsigned int
#define __CHAR32_TYPE__ unsigned int
#define __FLT_MAX__ 3.40282346638528859811704183484517e+38F
#define __INT32_TYPE__ int
#define __SIZEOF_DOUBLE__ 8
#define __FLT_MIN_10_EXP__ (-37)
#define __INTMAX_TYPE__ long long int
#define __DEC128_MAX_EXP__ 6145
#define __GNUC_MINOR__ 5
#define __UINTMAX_MAX__ 18446744073709551615ULL
#define __DEC32_MANT_DIG__ 7
#define __DBL_MAX_10_EXP__ 308
#define __LDBL_DENORM_MIN__ 4.94065645841246544176568792868221e-324L
#define __INT16_C(c) c
#define __STDC__ 1
#define __PTRDIFF_TYPE__ int
#define __UINT32_TYPE__ unsigned int
#define __UINTPTR_TYPE__ unsigned int
#define __DEC64_SUBNORMAL_MIN__ 0.000000000000001E-383DD
#define __DEC128_MANT_DIG__ 34
#define __LDBL_MIN_10_EXP__ (-291)
#define __SIZEOF_LONG_LONG__ 8
#define __LDBL_DIG__ 31
#define __UINT_FAST16_MAX__ 4294967295U
#define __GNUC_GNU_INLINE__ 1
#define __UINT_FAST8_TYPE__ unsigned char

gcc -dM -E - < /dev/null

lucasrangit · 2012-04-27 17:37:50 0

Check if commands are available on your system
This is sample output - yours may be different.
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
Display GCC Predefined Macros

another one
This is sample output - yours may be different.
0

echo | gcc -dM -E -

Byung · 2011-05-09 09:59:24 0
Write and run a quick C program

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
This is sample output - yours may be different.
```
$ cat ~/.stdin.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <utmp.h>
#include <errno.h>

int main(int argc, char *argv[]) {
  #include "/dev/tty"
  return 0;
}

$ cstdin
Ctrl-D when done.
printf("Size of an unsigned long long is %lu\n", sizeof (unsigned long long));
Size of an unsigned long long is 8
```
-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

Display GCC Predefined Macros

doesn't need /dev/null Show Sample Output

gcc -dM -E - <<<''

bucciarati · 2009-10-28 14:26:56 0

Display GCC Predefined Macros
This is sample output - yours may be different.
8

gcc -dM -E - < /dev/null

ohe · 2009-10-28 14:13:19 1

The 1 millionth fibonacci number

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

Compile all C files in a directory

Compile *.c files with "gcc -Wall" in actual directory, using as output file the file name without extension.
This is sample output - yours may be different.
-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
C one-liners

/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
This is sample output - yours may be different.
```
c one liners
```
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
Klingon programming; weak code must die
This is sample output - yours may be different.
-6

gcc -Wall -Werror -o prog prog.c || rm -f prog.c

devoid · 2009-02-05 17:26:51 1

What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

Share Your Commands

Check These Out

Fetch the current human population of Earth

do something else while waiting for an event, such as reboot

until (ssh root@10.1.1.39 2> /dev/null); do date; sleep 15; done In this case will execute "date" then "sleep 15" until we are able to ssh into server, such as after a reboot Could also be like: until ( ping 10.1.1.39 1> /dev/null); do echo "server 10.1.1.39 is down"; sleep 15; done

Sending a file over icmp with hping

you need to start a listening hping on the reciever: hping3 --listen 10.0.2.254 -I eth0 --sign MSGID1 then you can send your file: hping3 10.0.2.254 --icmp --sign MSGID1 -d 50 -c 1 --file a_file

Embed next line on the end of current line using sed

N: On the current line, sed will display it on pattern space, plus a \n (new line); but s/\n//: Will get rid of new line displayed on pattern space, joining the current line's end with the start of the next line Useful in scripts.

Find dead symbolic links

Find the package that installed a command

extract element of xml

poor man's xml parser :)

Convert seconds to [DD:][HH:]MM:SS

Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

Iterate through current directory + all subs for C++ header files and rank by # of comments

This shows you which files are most in need of commenting (one line of output per file)

power off system in X minutes

Replace 60 with the number of minutes until you want the machine to shut down. Alternatively give an absolute time in the format hh:mm (shutdown -h 9:30) Or shutdown right away (shutdown -h now)

Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.

» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10

Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for:

» all commands
» commands with 3 up-votes (commandlinefu3)
» commands with 10 up-votes (commandlinefu10)
» commands using gcc