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Assembly Language "hello world"

$vim a.s

hello:
        .string "Hello world\n"

.globl main

main:
        movl $4, %eax
        movl $1, %ebx
        movl $hello, %ecx
        movl $12, %edx
        int $0x80

        ret



$gcc -g a.s -o a













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go url encoding




























 func  QueryUnescape  func QueryUnescape (s string ) ( string , error )   QueryUnescape does the inverse transformation of QueryEscape, converting %AB into the byte 0xAB and '+' into ' ' (space). It returns an error if any % is not followed by two hexadecimal digits.     func  QueryUnescape  func QueryUnescape (s string ) ( string , error )   QueryUnescape does the inverse transformation of QueryEscape, converting %AB into the byte 0xAB and '+' into ' ' (space). It returns an error if any % is not followed by two hexadecimal digits.  




















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go golang get disk usage free space remain info




























package main   import (   "fmt"   "syscall"  )   func main() {   fmt.Println(DiskUsage("./"))  }   func DiskUsage(path string) uint64 {   fs := syscall.Statfs_t{}   err := syscall.Statfs(path, &fs)   if err != nil {    return 0   }   return fs.Bfree * uint64(fs.Bsize)  }   //All space   = fs.Blocks * uint64(fs.Bsize)  //Free space = fs.Bfree * uint64(fs.Bsize)  //Used space= fs.All - disk.Free  




















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