commit bash-20130301 snapshot

examples/functions/coshell.README

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+Date: Fri, 21 Sep 2001 14:50:29 -0400
+From: "Jason M. Felice" <jfelice@cronosys.com>
+To: bash-maintainers@gnu.org, chet@po.cwru.edu
+Subject: Bash co-processes functions
+Message-ID: <20010921145029.A6093@argo.eraserhead.net>
+Mime-Version: 1.0
+
+Attached to this message you will find coprocess.bash and coshell.bash.
+Here's a brief synopsis of use:
+
+coprocess open telnet localhost
+while coprocess read il ; do
+  echo "$il"
+  case "$il" in
+    *ogin:*)
+      coprocess print 'user'
+      ;;
+    *ord:*)
+      echo 'pass' |coprocess print --stdin
+      ;;
+    *$ *)
+      coprocess print 'exit'
+      break
+      ;;
+  esac
+done
+coprocess close
+
+And here's an example of the coshell function:
+
+coshell open ssh -l root otherbox
+coshell eval hostname
+coshell ls -l
+if coshell test -d /tmp ; then echo 'otherbox has a /tmp!' ; fi
+
+coshell sendfile /var/lib/upgrade.rpm /tmp/test.rpm || exit $?
+coshell eval rpm -ivh /tmp/test.rpm || exit $?
+coshell eval rm -f /tmp/test.rpm || exit $?
+coshell close
+exit 0
+
+There are a few minor issues that I'd like to work out, but it works well
+enough for me ;-)  The issues are:
+
+- Shell quoting issue with 'coshell eval' commands - need to somehow
+  re-quote words.
+- Interactive commands hang 'coshell eval', tried redirecting in </dev/null
+  to executed command, but it caused strange shell exit problems.
+- Some way to copy stdin from local coshell eval to remote shell.  Probably
+  logically impossible, but would be wonderfully useful.
+
+I'm using it for writing scripts to publish websites and other scripts to
+co-located servers.