Hi guys,
I'm looking for a method to do raw command substitution.
The issue:
- Need a ksh93t+ / ksh93u facillity to be able to take the literal output of a
command with no substitutions or omissions, where the substitute data is less
than 1kB. Target platforms are RHEL 6.4, Solaris 11 & AIX 7.1.
Examples. printf is used below for illustration only.
- $(), command substitution, i.e. FOO=$(printf "\n\n\n\n\n"); seems unsuitable
as it modifies the output by performing some whitespace handling, such as
stripping newlines. In this example, FOO returns zero-length.
- "$()", quoted, prevents the field splitting and pathname expansions, but
doesn't protect the trailing whitespace.
- Binary read, i.e. printf "\n\n\n\n\n" | read -N$length FOO; works
provided the $length of the read doesn't encounter the EOF, in this case values
1-5. If $length>5, in this example, FOO becomes zero-length. For an input of
unknown length, this feels impractical.
- One possible workaround is adding a suffix and then chopping it, i.e.
FOO="$(printf "\n\n\n\n\nmysuffix")"; FOO="${FOO%mysuffix}"
Any advice on the best way to acquire the literal command output?
Thanks! -G_______________________________________________
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