On Fri, Feb 11, 2011 at 10:28 PM, Jon Seymour <jon.seym...@gmail.com> wrote: > Ok, so it relates to how ssh interprets its command argument: > > So: > > bash -c 'cd /tmp ; pwd' > > My expectation was that it would invoke bash with the arguments: > > '-c' > 'cd /tmp; pwd' > > But bash is actually invoked with: > > '-c' > 'cd' > '/tmp' > > and then pwd is invoked, presumably in same shell that invoked bash. > > This can be seen with this: > > jseymour@ubuntu:~$ ssh localhost bash -c 'echo\ \$\$\ \$PPID' ';' echo '$$' > 11553 11552 > 11552 > > bash is invoked with: > '-c' > 'echo $$ $PPID' > > then: > > echo $$ runs in the parent shell > > jon. > > > On Sat, Feb 12, 2011 at 2:44 PM, Dennis Williamson > <dennistwilliam...@gmail.com> wrote: >> On Fri, Feb 11, 2011 at 9:21 PM, Jon Seymour <jon.seym...@gmail.com> wrote: >>> Correction - a _leading_ cd command and only a leading cd command, >>> seems to be completely ignored in the case I described. >>> >>> Why is this? >>> >>> jon. >>> >>> ---------- Forwarded message ---------- >>> From: Jon Seymour <jon.seym...@gmail.com> >>> Date: Sat, Feb 12, 2011 at 2:18 PM >>> Subject: Can someone explain this? >>> To: bug-bash@gnu.org >>> >>> >>> Can someone explain why this is happening? >>> >>> #expected >>> $ bash -c 'cd /tmp; pwd' >>> /tmp >>> >>> #expected >>> $ bash -c 'pwd; cd /tmp; pwd' >>> /home/jseymour >>> /tmp >>> >>> #expected >>> $ ssh localhost bash -c 'pwd; cd /tmp; pwd' >>> /home/jseymour >>> /tmp >>> >>> #unexpected >>> $ ssh localhost bash -c 'cd /tmp; pwd' >>> /home/jseymour >>> >>> My expectation is that the last command should print: >>> >>> /tmp >>> >>> But, instead, the cd command seems to be completely ignored when bash >>> is run under ssh. I have reproduced this with bash 4.1.5 on Linux and >>> bash 3.0.0 on AIX. >>> >>> jon. >>> >>> >> >> It's not particular to Bash. I can reproduce it in several other shells. >> >
Yes, do your quoting like this: ssh localhost 'bash -c "cd /tmp; pwd"' and your test would look like this: $ ssh localhost 'bash -c "echo $$; echo \$\$; cd /tmp; pwd"'; echo $$ 6324 6324 /tmp 6370 or this: $ ssh localhost 'echo $$; bash -c "echo $$; echo \$\$; cd /tmp; pwd"'; echo $$ 6523 6523 6524 /tmp 6370 Notice what happens with the PIDs when a shell has to be started before Bash is explicitly started.
