Bash脚本。通过所有ASCII字符迭代 [英] Bash script. Iterate through all ASCII chars
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问题描述
我知道如何通过人物迭代
I know how to iterate through characters
for c in {a..z}
但我无法弄清楚,如何通过所有ASCII字符迭代。
我敢肯定,它应该是很容易的。
But I can't figure out, how to iterate through all ASCII chars. I'm sure, it should be really easy.
推荐答案
你可以做的就是迭代从0到127,然后将十进制值转换为字符的ASCII值(或后)。
What you can do is to iterate from 0 to 127 and then convert the decimal value to its ASCII value(or back).
您可以使用这些功能来做到这一点:
You can use these functions to do it:
# POSIX
# chr() - converts decimal value to its ASCII character representation
# ord() - converts ASCII character to its decimal value
chr() {
[ ${1} -lt 256 ] || return 1
printf \\$(printf '%03o' $1)
}
# Another version doing the octal conversion with arithmetic
# faster as it avoids a subshell
chr () {
[ ${1} -lt 256 ] || return 1
printf \\$(($1/64*100+$1%64/8*10+$1%8))
}
# Another version using a temporary variable to avoid subshell.
# This one requires bash 3.1.
chr() {
local tmp
[ ${1} -lt 256 ] || return 1
printf -v tmp '%03o' "$1"
printf \\"$tmp"
}
ord() {
LC_CTYPE=C printf '%d' "'$1"
}
# hex() - converts ASCII character to a hexadecimal value
# unhex() - converts a hexadecimal value to an ASCII character
hex() {
LC_CTYPE=C printf '%x' "'$1"
}
unhex() {
printf \\x"$1"
}
# examples:
chr $(ord A) # -> A
ord $(chr 65) # -> 65
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