The strace for it is interesting. It looks like wdiff does a stat on the
files and the result returns is 0.
strace -efile wdiff -1 <(echo -e "line1\nline2") <(echo -e "line1\nline3")
execve("/usr/bin/wdiff", ["wdiff", "-1", "/dev/fd/63", "/dev/fd/62"], [/* 44
vars */]) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY) = 3
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/libncurses.so.5", O_RDONLY) = 3
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/tls/i686/cmov/libc.so.6", O_RDONLY) = 3
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/tls/i686/cmov/libdl.so.2", O_RDONLY) = 3
stat64("/dev/fd/63", {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
open("/dev/fd/63", O_RDONLY) = 3
open("/tmp/wdiff.bF8FQN", O_RDWR|O_CREAT|O_EXCL, 0600) = 4
stat64("/dev/fd/62", {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
open("/dev/fd/62", O_RDONLY) = 4
open("/tmp/wdiff.HqUIDm", O_RDWR|O_CREAT|O_EXCL, 0600) = 5
--- SIGCHLD (Child exited) @ 0 (0) ---
unlink("/tmp/wdiff.bF8FQN") = 0
unlink("/tmp/wdiff.HqUIDm") = 0
{++}Process 20780 detached
I suspect that's causing it to think the files are empty and not doing
anything.
diff however does work for named pipes,
$ diff -u <(echo -e "line1\nline2") <(echo -e "line1\nline3")
--- /dev/fd/63 2009-03-30 12:17:43.235246354 +0100
+++ /dev/fd/62 2009-03-30 12:17:43.235246354 +0100
@@ -1,2 +1,2 @@
line1
-line2
+line3
--
wdiff does not work correctly with <() redirection
https://bugs.launchpad.net/bugs/160912
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