Shell Programming and Scripting

scp $host:/tmp/$host*.whatever ...

REMOTE_FILE=$(ssh $host 'cat /tmp/$(hostname).html.gz')

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ssh ...... > $host.html.gz

for host in `cat $PATH_TMP/servers/host_linux2_test`
    do        
        echo "----------------    RUNNING HEALTH CHECK FOR $host   ----------------" >> $PATH_TMP/Linux_cfg2html.log        
        ssh $host "cfg2html-linux -xApo /tmp/" >> $PATH_TMP/Linux_cfg2html.log
        echo "*****************    COMPRESSING FILE in $host   *********************" >> $PATH_TMP/Linux_cfg2html.log
        ssh "$host" '/bin/gzip /tmp/"$(hostname)".html' >> "$PATH_TMP"/Linux_cfg2html.log
        echo "*****************    COPYING FILE TO harp   *********************" >> $PATH_TMP/Linux_cfg2html.log
        scp -p $host:/tmp/"$(hostname)".html.gz $PATH_TMP/servers/Linux/ >> $PATH_TMP/Linux_cfg2html.log
        echo "*****************    REMOVING FILES from $host   *********************" >> $PATH_TMP/Linux_cfg2html.log
        ssh $host "rm -fr /tmp/`hostname`*" >> $PATH_TMP/Linux_cfg2html.log
        echo "----------------------------    DONE    -----------------------------" >> $PATH_TMP/Linux_cfg2html.log
        echo >> $PATH_TMP/Linux_cfg2html.log
    done

scp -p $host:/tmp/"$(hostname)".html.gz $PATH_TMP/servers/Linux/ >> $PATH_TMP/Linux_cfg2html.log

ssh username@host exec /bin/sh -s arg1 arg2 < local-file.sh

$ cat script.sh
#!/bin/sh

echo Remote hostname is `hostname`
echo Arguments are $*
exit 0
$ ssh username@server exec /bin/sh -s $HOSTNAME qwertyuipo < script.sh
Remote hostname is steward
Arguments are localname qwertyuipo
$

while read host
    do        
        echo "----------------    RUNNING HEALTH CHECK FOR $host   ----------------"        
        ssh $host "cfg2html-linux -xApo /tmp/"
        echo "*****************    COMPRESSING FILE in $host   *********************"
        ssh "$host" '/bin/gzip /tmp/"$(hostname)".html'
        echo "*****************    COPYING FILE TO harp   *********************"
        ssh $host 'cat /tmp/"$(hostname)".html.gz' > $PATH_TMP/servers/Linux/$host.html.gz
        echo "*****************    REMOVING FILES from $host   *********************"
        ssh $host "rm -fr /tmp/`hostname`*"
        echo "----------------------------    DONE    -----------------------------"
        echo
    done < $PATH_TMP/servers/host_linux2_test  >> $PATH_TMP/Linux_cfg2html.log

while read host
    do
            # Here-document is an alternative to feeding it a script file
            # Everything between <<"EOF" and EOF gets fed into the remote host's shell.
            #
            # the script creates the html, and compresses it to stdout.
            # we take stdout and put it into ${host}-config.gz
            # we take stderr and put it into the log file, >&1
            ssh $host exec /bin/sh -s $HOSTNAME 2>&1 > ${host}-config.html.gz <<"EOF"
                # If you echo anything here, send it into >&2, i.e. stderr
                echo "----------------    RUNNING HEALTH CHECK FOR $HOSTNAME   ----------------" >&2
                echo "----------------    (Remote host is $1)   ----------------" >&2
                # Everything in this block gets sent literally.  $(hostname) is remote.
                cfg2html-linux -xApo /tmp/
                # gzip to standard output, instead of resaving to file.gz
                # standard output goes across the ssh connection and is saved into ${host}-config.html.gz
                /bin/gzip - < /tmp/"$(hostname)".html
                rm -f /tmp/$(hostname).html
# MUST be at the beginning of the line.  Do not indent!
EOF

    done < $PATH_TMP/servers/host_linux2_test  >> $PATH_TMP/Linux_cfg2html.log

gzip: scxcdb4-config.html.gz: not in gzip format

while read host
    do
            # Here-document is an alternative to feeding it a script file
            # Everything between <<"EOF" and EOF gets fed into the remote host's shell.
            #
            # the script creates the html, and compresses it to stdout.
            # we take stdout and put it into ${host}-config.gz
            # we ignore stderr.
            ssh $host exec /bin/sh -s $HOSTNAME 2>/dev/null > ${host}-config.html.gz <<"EOF"
                # If you echo anything here, send it into >&2, i.e. stderr
                echo "----------------    RUNNING HEALTH CHECK FOR $HOSTNAME   ----------------" >&2
                echo "----------------    (Remote host is $1)   ----------------" >&2
                # Everything in this block gets sent literally.  $(hostname) is remote.
                # redirecting everything in case cfg2html is chattering
                cfg2html-linux -xApo /tmp/ >/dev/null 2>/dev/null
                # gzip to standard output, instead of resaving to file.gz
                # standard output goes across the ssh connection and is saved into ${host}-config.html.gz
                /bin/gzip - < /tmp/"$(hostname)".html
                rm -f /tmp/$(hostname).html
# MUST be at the beginning of the line.  Do not indent!
EOF

    done < $PATH_TMP/servers/host_linux2_test  >> $PATH_TMP/Linux_cfg2html.log