certainly not the same output; for one thing it properly takes the md5 of sudoers now and never did before.
But argh, there's NO REASON for it to immediately break the loop like that given the data you've shown me. There's not even any break statement in it, it can't break until read actually fails! And because you're always stripping out the box names I'll never know what it really, really says and what your your hosts command actually, really prints. I could easily be missing something obvious.
You never told me what one bit of code did. I'll update it:
Code:
while read fname; do
bname=$(basename $fname)
echo "trying ${fname} (${bname})" >&2
hash=$(/usr/local/bin/md5 "$fname" | awk '{print $4}')
echo "local hash is ${hash}"
# should just print the md5's
/usr/local/bin/hosts | while read box
do
echo "${box}"
# should print md5's repeatedly
ssh ${box} "/usr/local/bin/md5" "$fname"
done
done < /home/izivanov/iz3
---------- Post updated at 01:24 PM ---------- Previous update was at 01:07 PM ----------
[edit] The only possible thing that could be eating all the filenames before they're read is ssh. You don't have the usual md5sum command; maybe it's still trying to read from standard input, and in doing so, eating all the output from hosts. Try this:
Code:
# If you don't have mktemp, TMP=/tmp/$$ will do. mktemp is more secure.
TMP=`mktemp`
while read fname; do
#bname=$(basename $fname)
echo "trying ${fname}" >&2
if ! /usr/local/bin/md5 "$fname" > "$TMP" </dev/null
then
echo "md5 on ${bname} failed: "
# print the error
cat "$TMP"
continue
fi
hash=$(awk '{print $4}' "$TMP")
echo "local hash is ${hash}" >&2
# should just print the md5's
/usr/local/bin/hosts | while read box
do
# redirect its stdin to prevent it reading any filenames
ssh "${box}" "/usr/local/bin/md5" "${fname}" > "$TMP" </dev/null
# Skip errors
[ "$?" -eq 0 ] || continue
remotehash=$(awk '{print $4;}' < "$TMP")
[ "$remotehash" = "$hash" ] || echo "${box} $fname differs!"
done
done < /home/izivanov/iz3
# clean up temp file
rm -f "$TMP"
I have a script that runs the grub-md5-crypt command based on whether the pass_value variable is a non-zero string. The md5 hash is being created in the /opt/hostconfigs/$HOST file, but I can't echo $md5_value. It is blank. Is there a way to create and echo a md5 hash variable?
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Discussion started by: torchij
16 Replies
LEARN ABOUT CENTOS
pmloadderivedconfig
PMLOADDERIVEDCONFIG(3) Library Functions Manual PMLOADDERIVEDCONFIG(3)NAME
pmLoadDerivedConfig - load derived metric definitions from a file
C SYNOPSIS
#include <pcp/pmapi.h>
int pmLoadDerivedConfig(char *fname);
cc ... -lpcp
DESCRIPTION
Each line of the file fname is either a comment line (with a ``#'' in the first position of the line) or the declaration of a derived per-
formance metric, specified as:
* the name of the derived metric, using the same ``dot notation'' syntax that is used for PCP performance metrics, see PCPIntro(1) and
pmns(5).
* an equals sign (``='')
* a valid expression for a derived metric, as described in pmRegisterDerived(3).
White space is ignored in the lines.
For each line containing a derived metric definition, pmRegisterDerived(3) is called to register the new derived metric.
The result from pmLoadDerivedConfig will be the number of derived metrics loaded from fname else a value less than zero in the case of an
error.
EXAMPLE
# sample derived metric definitions
bad_in_pkts = network.interface.in.errors + network.interface.in.drops
# note the following would need to be on a single line ...
disk.dev.read_pct = 100 * delta(disk.dev.read) /
(delta(disk.dev.read) + delta(disk.dev.write))
SEE ALSO PCPIntro(1), PMAPI(3) and pmRegisterDerived(3).
Performance Co-PilotPMLOADDERIVEDCONFIG(3)
03-09-2011
