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Full Discussion: Quick bash question
Top Forums Shell Programming and Scripting Quick bash question Post 302454049 by Chirel on Friday 17th of September 2010 05:31:35 AM
Old 09-17-2010
Hi,

Finding a solution for this problem was fun i must admit.

Here is one solution full bash.

This script will do as many max concurrent process as you want, just set MAXJOBS to it.

Typical usage is cat iplist.lst | thescript.sh

Code:
#!/bin/bash

# Max concurrent job process
MAXJOBS=60

trap "kill 0" EXIT

IPLIST=($(cat))

index=0
index_count=${#IPLIST[@]}

function doping {
    local ipad=$1
    if [ -n "$ipad" ] ; then
        ping -c4 -q $ipad &>/dev/null
        [ $? -eq 0 ] && echo "Host : $ipad is up" || echo "Host : $ipad is down"
    fi
}

while [[ $index -le $index_count ]]
do
  # The current ip
  IPADDR=${IPLIST[$index]}

  NBJOBS=$(jobs -p | wc -l)
  if [ "$NBJOBS" -lt "$MAXJOBS" ] ; then

      doping $IPADDR &
      ((index++))
      continue

  fi
done
wait

Tested it with 400+ Hosts and MAXJOBS=200 it was faaast Smilie
This User Gave Thanks to Chirel For This Post:
 

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GIT-MERGE-INDEX(1)						    Git Manual							GIT-MERGE-INDEX(1)

NAME
git-merge-index - Run a merge for files needing merging SYNOPSIS
git merge-index [-o] [-q] <merge-program> (-a | [--] <file>*) DESCRIPTION
This looks up the <file>(s) in the index and, if there are any merge entries, passes the SHA-1 hash for those files as arguments 1, 2, 3 (empty argument if no file), and <file> as argument 4. File modes for the three files are passed as arguments 5, 6 and 7. OPTIONS
-- Do not interpret any more arguments as options. -a Run merge against all files in the index that need merging. -o Instead of stopping at the first failed merge, do all of them in one shot - continue with merging even when previous merges returned errors, and only return the error code after all the merges. -q Do not complain about a failed merge program (a merge program failure usually indicates conflicts during the merge). This is for porcelains which might want to emit custom messages. If git merge-index is called with multiple <file>s (or -a) then it processes them in turn only stopping if merge returns a non-zero exit code. Typically this is run with a script calling Git's imitation of the merge command from the RCS package. A sample script called git merge-one-file is included in the distribution. ALERT ALERT ALERT! The Git "merge object order" is different from the RCS merge program merge object order. In the above ordering, the original is first. But the argument order to the 3-way merge program merge is to have the original in the middle. Don't ask me why. Examples: torvalds@ppc970:~/merge-test> git merge-index cat MM This is MM from the original tree. # original This is modified MM in the branch A. # merge1 This is modified MM in the branch B. # merge2 This is modified MM in the branch B. # current contents or torvalds@ppc970:~/merge-test> git merge-index cat AA MM cat: : No such file or directory This is added AA in the branch A. This is added AA in the branch B. This is added AA in the branch B. fatal: merge program failed where the latter example shows how git merge-index will stop trying to merge once anything has returned an error (i.e., cat returned an error for the AA file, because it didn't exist in the original, and thus git merge-index didn't even try to merge the MM thing). GIT
Part of the git(1) suite Git 2.17.1 10/05/2018 GIT-MERGE-INDEX(1)
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