我想建立一个可以读取文件的bash程序,像* .bin并打印所有的十六进制数字,作为’十六进制’编辑器.在哪里可以开始
编辑：添加“bytestream”功能.如果脚本名称包含单词“stream”(例如,它是一个符号链接,如ln -s bash-hexdump bash-hexdump-stream并运行为./bash-hexdump-stream),则会输出一个连续的十六进制字符流文件的内容.否则它的输出将看起来像hexdump -C.
这需要一堆诡计,因为Bash不是很好的二进制：
#!/bin/bash
# bash-hexdump
# by Dennis Williamson - 2010-01-04
# in response to https://stackoverflow.com/questions/2003803/show-hexadecimal-numbers-of-a-file
# usage: bash-hexdump file
if [[ -z "$1" ]]
then
exec 3<&0 # read stdin
[[ -p /dev/stdin ]] || tty="yes" # no pipe
else
exec 3<"$1" # read file
fi
# if the script name contains "stream" then output will be continuous hex digits
# like hexdump -ve '1/1 "%.2x"'
[[ $0 =~ stream ]] && nostream=false || nostream=true
saveIFS="$IFS"
IFS="" # disables interpretation of \t,\n and space
saveLANG="$LANG"
LANG=C # allows characters > 0x7F
bytecount=0
valcount=0
$nostream && printf "%08x " $bytecount
while read -s -u 3 -d '' -r -n 1 char # -d '' allows newlines,-r allows \
do
((bytecount++))
printf -v val "%02x" "'$char" # see below for the ' trick
[[ "$tty" == "yes" && "$val" == "04" ]] && break # exit on ^D
echo -n "$val"
$nostream && echo -n " "
((valcount++))
if [[ "$val" < 20 || "$val" > 7e ]]
then
string+="." # show unprintable characters as a dot
else
string+=$char
fi
if $nostream && (( bytecount % 8 == 0 )) # add a space down the middle
then
echo -n " "
fi
if (( bytecount % 16 == 0 )) # print 16 values per line
then
$nostream && echo "|$string|"
string=''
valcount=0
$nostream && printf "%08x " $bytecount
fi
done
if [[ "$string" != "" ]] # if the last line wasn't full,pad it out
then
length=${#string}
if (( length > 7 ))
then
((length--))
fi
(( length += (16 - valcount) * 3 + 4))
$nostream && printf "%${length}s\n" "|$string|"
$nostream && printf "%08x " $bytecount
fi
$nostream && echo
LANG="$saveLANG";
IFS="$saveIFS"
撇号技巧记载在here.相关部分说：
If the leading character is a
single-quote or double-quote,the
value shall be the numeric value in
the underlying codeset of the
character following the single-quote
or double-quote.
下面是脚本的一些输出,显示了我/ bin / bash的前几行再加上几行：
00000000 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00 |.ELF............| 00000010 02 00 03 00 01 00 00 00 e0 1e 06 08 34 00 00 00 |............4...| 00000020 c4 57 0d 00 00 00 00 00 34 00 20 00 09 00 28 00 |.W......4. ...(.| 00000030 1d 00 1c 00 06 00 00 00 34 00 00 00 34 80 04 08 |........4...4...| . . . 00000150 01 00 00 00 2f 6c 69 62 2f 6c 64 2d 6c 69 6e 75 |..../lib/ld-linu| 00000160 78 2e 73 6f 2e 32 00 00 04 00 00 00 10 00 00 00 |x.so.2..........| 00000170 01 00 00 00 47 4e 55 00 00 00 00 00 02 00 00 00 |....GNU.........|
