commandline session $cat main.c #include<stdio.h> #include<math.h> int main(void) { int i; float y; printf(“n The Geek Stuff [%d]n”, i); y=sinf(2.5); printf(“%fn”,y); return 0; } $gcc main.c $./a.out The Geek Stuff [0] 0.598472 $gcc main.c -lmath /usr/bin/ld: cannot find -lmath collect2: error: ld returned 1 exit status $gcc main.c -llibmath /usr/bin/ld: cannot find -llibmath collect2: error: …
Monthly Archives: January 2013
GCC commandline option -save-temps
-save-temps Store the usual “temporary” intermediate files permanently; place them in the current directory and name them based on the source file. Thus, compiling `foo.c’ with `-c -save-temps’ would produce files `foo.i’ and `foo.s’, as well as `foo.o’. This creates a preprocessed `foo.i’ output file even though the compiler now normally uses an integrated preprocessor. …
GCC COMMANDLINE OPTIONS PART 3
commandline session $cat main.c #include<stdio.h> int main(void) { int i; printf(“n The Geek Stuff [%d]n”, i); return 0; } $gcc -C main.c $ls -l main main main.c main.i main.s $ls -l main. main.c main.i main.s $ls -l main. ls: cannot access main.: No such file or directory $rm main $rm a.out $gcc -C main.c $ls …
lspci -vmm . Dump PCI device data in a machine readable form for easy parsing by scripts
commandline session $lspci -vmm Slot: 00:00.0 Class: RAM memory Vendor: NVIDIA Corporation Device: MCP61 Memory Controller SVendor: Giga-byte Technology SDevice: Device 5001 Rev: a1 Slot: 00:01.0 Class: ISA bridge Vendor: NVIDIA Corporation Device: MCP61 LPC Bridge SVendor: Giga-byte Technology SDevice: Device 0c11 Rev: a2 Slot: 00:01.1 Class: SMBus Vendor: NVIDIA Corporation Device: MCP61 SMBus SVendor: …
GCC COMMANDLINE OPTIONS PART 2
commandline session $gcc -S main.c > main.s $cat main.s .file “main.c” .section .rodata .LC0: .string “n The Geek Stuff [%d]n” .text .globl main .type main, @function main: .LFB0: .cfi_startproc pushq %rbp .cfi_def_cfa_offset 16 .cfi_offset 6, -16 movq %rsp, %rbp .cfi_def_cfa_register 6 subq $16, %rsp movl -4(%rbp), %eax movl %eax, %esi movl $.LC0, %edi movl $0, …
GCC COMMANDLINE OPTIONS PART 1
commandline session $cat main.c #include<stdio.h> int main(void) { printf(“n The Geek Stuffn”); return 0; } $gcc main.c $./a.out The Geek Stuff $gcc main.c -o main $./main The Geek Stuff $gcc -Wall main.c -o main $./main The Geek Stuff $cat main.c #include<stdio.h> int main(void) { int i; printf(“n The Geek Stuff [%d]n”, i); return 0; } …
FREE COMMAND WITH DIFFERENT UNITS
commandline session $free -b total used free shared buffers cached Mem: 2043490304 1840762880 202727424 0 37040128 823631872 -/+ buffers/cache: 980090880 1063399424 Swap: 5984219136 15114240 5969104896 $free -k total used free shared buffers cached Mem: 1995596 1795388 200208 0 36196 804388 -/+ buffers/cache: 954804 1040792 Swap: 5843964 14760 5829204 $free -m total used free shared buffers …
DEBIAN xrandr The X Resize, Rotate and Reflect Extension (RandR)
$xrandr | grep connected VGA-0 connected 1024×768+0+0 (normal left inverted right x axis y axis) 340mm x 270mm $xrandr –output VGA-0 –brightness 1 $xrandr –output VGA-0 –brightness 0.5 $ Theory Drop The X Resize, Rotate and Reflect Extension (RandR)[2] is an X Window System extension, which allows clients to dynamically change X screens, so as …
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UNIT TESTING trueprint
commandline session $ls acconfig.h bootstrap config.cache config.log configure.in INSTALL Makefile.in replace stamp-h1.in aclocal.m4 ChangeLog config.h config.status COPYING Makefile NEWS src stamp-h2.in AUTHORS config config.h.in configure doc Makefile.am README stamp-h tests $make check Makefile:122: warning: overriding commands for target `config.h’ Makefile:103: warning: ignoring old commands for target `config.h’ Makefile:132: warning: overriding commands for target `config.h.in’ Makefile:113: …
TEE . read from standard input and write to standard output and files
commandline session $stat version.c File: `version.c’ Size: 0 Blocks: 0 IO Block: 4096 regular empty file Device: 801h/2049d Inode: 5415089 Links: 1 Access: (0644/-rw-r–r–) Uid: ( 1000/ jeffrin) Gid: ( 1000/ jeffrin) Access: 2013-01-07 19:05:13.000000000 +0530 Modify: 2013-01-07 21:55:50.000000000 +0530 Change: 2013-01-07 21:55:50.000000000 +0530 Birth: – $stat version.c | tee newversion.c File: `version.c’ Size: 0 …
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