我想做这样的事情：
'{
var = "value";
"echo -n "$var"|"xxd -r -p"|"sha256sum"|"cut -d " " -f 1"|getline var;
}'
我想在awk中我不能以这种方式使用piplines，那么如何在awk中将其实现呢？
'{
var = "value"
cmd = "echo -n 47" var " 47 | xxd -r -p | sha256sum | cut -d " " -f 1"
var = ( (cmd | getline line) > 0 ? line : "Failed: " var )
close(cmd)
print var
}'
但是，这不太可能是做任何你想做的事情的最佳方式。我将var设置为"Failed: " var。如果到getline的管道失败，你必须决定如何处理它。请参阅http://awk.freeshell.org/AllAboutGetline关于何时/如何使用getline，还有许多注意事项。
测试并确认在mawk、gawk和nawk上工作
=
<( … input_from_/dev/stdin … )> |
mawk '
function ______(__,_) {
1 _ = "47"
1 gsub(_, "&\" (_)_,__)
1 return (_)(__)_
}
function _______(__,_,___) {
1 return
substr( (___ = RS)*(RS = "n"),
(_=" printf 47%s47 " (______(__))" | xxd -p "
" | xxd -p -r | xxh128sum | awk NF=1") | getline __,
close(_)*_*(RS = ___))__
}
{
1 print $+(_="")
1 printf("n xxhash-128-from-_INPUT_ :: ")
1 printf("%s", $-_) | (__="xxh128sum ")
1 close(__)
1 _ = _______($-_)
1 print "n xxhash-128-from-getline "
":: getline :: [[ "(_)" ]]n" } '
---这是一行，但为了可读性而重新格式化了
The quick brown fox !"#$%&'()*+,-./0123456789:;<=>
?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[]^_`abcdefghijklmnop
qrstuvwxyz{|}~jumps over the lazy !"#$%&'()*+,-./0
123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[]^_`ab
cdefghijklmnopqrstuvwxyz{|}~dog
xxhash-128-from-_INPUT_ :: 5a43bf3eab449ca21b817f0baeee2a4b stdin
xxhash-128-from-getline :: getline :: [[ 5a43bf3eab449ca21b817f0baeee2a4b ]]