Re: [clug-talk] bashing my brains out - fixed

[caziz]

Found help on another Calgary 'nix club site. O:-)

ssh -n ${hostNAME} /tmp/${cmdREMOTE} > ${cmdLOCAL}; # run the script

OR ..

echo test | ssh ${hostNAME} /tmp/${cmdREMOTE} > ${cmdLOCAL}; # run the script


and it runs all 3 iterations!

Don't let the bash bugs bite! :-[

Thanks,
Chris

excerpt from man ssh:
 -n      Redirects stdin from /dev/null (actually, prevents reading from 
stdin).  This
             must be used when ssh is run in the background.  A common trick is 
to use
             this to run X11 programs on a remote machine.
(This does not work if ssh  needs to ask for a password or passphrase; see also 
the -f option.)


On 12-11-08 06:58 PM, caziz wrote:

Hi  All,

  This bash bug is driving me up the wall. A "simple" cheap script
to catch 1 line process descriptions from man pages (usually correct)
such as:

acpid - Advanced Configuration and Power Interface event daemon

My problem:

./pleaseLOOP  host3   # quits after 1 iteration (with correct result for that 
iteration)

but if I comment off the ssh call at line 23 it runs 3 iterations as expected.
ssh call without the redirection still quits after 1 iteration.

I can not see the problem.  (Help)

Thanks,
Chris


cat -n cat -n host3   # file lines are <process> <hostname>
     1    acpid  host1
     2    acpid  host2
     3    xinetd host3

cat -n pleaseLOOP
     1    #!/bin/bash
     2    #
     3    #  query process description from man page
     4    #
     5    #
     6    cmdLOCAL=$(date +%Y%m%d-%H%M%S-$$LOCAL) # unique local name
     7    cmdREMOTE=myselfRunScriptRemotely          # remote script name
     8    echo "  cmdLOCAL: ${cmdLOCAL}"
     9
    10    while read -r -a line         # read line into array (space is ele 
seperator
    11    do
    12      procNAME="${line[0]}";   # process name
    13      hostNAME="${line[1]}";   # host    name
    14    #
    15    #   -- build the command to run remotely  Example:
    16    #  x="$(man acpid | grep acpid | grep \- | head -1)"; echo 
procDESC=\"${x}\"
    17

18 echo "x=\"\$(man ${procNAME} | grep ${procNAME} | grep \- | head -1)\"; echo procDESC=\\\"\${x}\\\"" > ${cmdREMOTE}

    19      chmod +x ${cmdREMOTE}
    20
    21      #
    22      scp ${cmdREMOTE} ${hostNAME}:/tmp/${cmdREMOTE}    # copy the script
    23      ssh ${hostNAME}  /tmp/${cmdREMOTE} > ${cmdLOCAL}; # run the script
    24      chmod +x ${cmdLOCAL}
    25      echo "===============${cmdLOCAL}"
    26      cat ./${cmdLOCAL}
    27      echo "===============${cmdLOCAL}"
    28      . ./${cmdLOCAL}
    29      # fix up NULL procDESC
    30      if [ -z "${procDESC}" ]
    31      then
    32        procDESC="No manual entry for ${procNAME}"
    33      fi
    34      echo "p: ${procNAME}  h: ${hostNAME} d: ${procDESC}"
    35      echo "  .. end of loop iteration"
    36
    37    done < $1
    38
    39    # get rid of it
    40    rm -vf ${cmdLOCAL}
    41    echo "Debug cat of ${cmdREMOTE}:"
    42    cat ${cmdREMOTE}
    43    rm -vf ${cmdREMOTE}

<<attachment: caziz.vcf>>

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