使用awk 手册中的序数函数,您可以这样做:
awk -f ord.awk --source '{
# replace : with - in the first field
gsub(/:/,"-",$1)
# calculate the ordinal by looping over the characters in the fourth field
res=ord($4)
for(i=2;i<=length($4);i++) {
res=res","ord(substr($4,i))
}
$4=res
}1' file
输出:
@ID---12345/1 ACGACTACGA text 33,34,35,36,37,118,119,120,121,122
@ID---12345/2 TATGACGACTA text 58,59,60,61,62,63,86,87,88,89,90
这是ord.awk
(取自:http ://www.gnu.org/software/gawk/manual/html_node/Ordinal-Functions.html )
# ord.awk --- do ord and chr
# Global identifiers:
# _ord_: numerical values indexed by characters
# _ord_init: function to initialize _ord_
BEGIN { _ord_init() }
function _ord_init( low, high, i, t)
{
low = sprintf("%c", 7) # BEL is ascii 7
if (low == "\a") { # regular ascii
low = 0
high = 127
} else if (sprintf("%c", 128 + 7) == "\a") {
# ascii, mark parity
low = 128
high = 255
} else { # ebcdic(!)
low = 0
high = 255
}
for (i = low; i <= high; i++) {
t = sprintf("%c", i)
_ord_[t] = i
}
}
function ord(str, c)
{
# only first character is of interest
c = substr(str, 1, 1)
return _ord_[c]
}
function chr(c)
{
# force c to be numeric by adding 0
return sprintf("%c", c + 0)
}
如果你不想包括整个ord.awk
,你可以这样做:
awk 'BEGIN{ _ord_init()}
function _ord_init(low, high, i, t)
{
low = sprintf("%c", 7) # BEL is ascii 7
if (low == "\a") { # regular ascii
low = 0
high = 127
} else if (sprintf("%c", 128 + 7) == "\a") {
# ascii, mark parity
low = 128
high = 255
} else { # ebcdic(!)
low = 0
high = 255
}
for (i = low; i <= high; i++) {
t = sprintf("%c", i)
_ord_[t] = i
}
}
{
# replace : with - in the first field
gsub(/:/,"-",$1)
# calculate the ordinal by looping over the characters in the fourth field
res=_ord_[substr($4,1,1)]
for(i=2;i<=length($4);i++) {
res=res","_ord_[substr($4,i,1)]
}
$4=res
}1' file