Eric S. Johansson <e...@harvee.org> 2010-04-19 16:52: <snip/> > A better solution may be dtach. I like it better than screen because I > use Emacs and I don't care about multiple screens a single terminal > session. The reason I don't use it is because I can't invoke it with the > logic "use the first unattached session or create a new session." I want > this capability because it would let me stick the head end invocation > inside of a login script and solve 90% of my reconnection problems very > very simply.
Just to contest the point, that's easily done with screen too. I source the attached file from my ~/.bashrc. It includes some special cases for local vs. remote vs. cssh sessions, but the idea should be clear enough. Brian
#!/bin/bash
# ~/.bashrc.d/screen
# 2009-12-21
# bpkroth
#
# Auto launch screen on SSH connections
# Sometimes a pain to deal with SSH screen sessions.
# Can be done with C-a a* though.
# Also a good idea to always use a hardstatus or caption line in .screenrc
if [ $EUID != 0 ] && [[ $TERM != screen* ]] && bin_in_path screen; then
if [ -n "$LC_CSSH" ]; then
# This special variable was set to denote this
# connection as a member of a CSSH session. Use the
# value of the variable to select or create a screen
# session with that name.
if screen -list | grep "[0-9]\+\.$LC_CSSH[ ]*" > /dev/null; then
screen -x $LC_CSSH
else
screen -S $LC_CSSH
fi
elif [ -n "$SSH_TTY" ]; then
# This is a remote session.
# Connect to the singular screen instance if it is
# available, else list if there are multiple, else
# start a new one.
N=`screen -list | grep -c '[0-9].*tached'`
if [ $N == 1 ]; then
screen -x
elif [ $N == 0 ]; then
#exec screen # no, i want to be able to detach
screen
else
echo
screen -list
fi
#else # local connection, don't open a screen session
# #exec screen
# screen
fi
fi
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