오메가맨의 필기수첩

altibase@MyUbuntu:~$  df -P -k /home | grep -v File

/dev/sda1         29799484 20586024   7676692      73% /

altibase@MyUbuntu:~$ df -P -k /home | grep -v File | sed  -e "s/\ \+/ /g"  

/dev/sda1 29799484 20586040 7676676 73% /

Avoiding global variables means you can use the function in a pipe. Here is an example:

#!/bin/bash

makeJunk()
{
   echo 'this is junk'
   echo '#more junk and "b@d" characters!'
   echo '!#$^%^&(*)_^&% ^$#@:"<>?/.,\\"'"'"
}

processJunk()
{
    local -a arr=()    
    # read each input and add it to arr
    while read -r line
    do 
       arr[${#arr[@]}]='"'"$line"'" is junk'; 
    done;

    # output the array as a string in the "declare" representation
    declare -p arr | sed -e 's/^declare -a [^=]*=//'
}

# processJunk returns the array in a flattened string ready for "declare"
# Note that because of the pipe processJunk cannot return anything using
# a global variable
returned_string=`makeJunk | processJunk`

# convert the returned string to an array named returned_array
# declare correctly manages spaces and bad characters
eval "declare -a returned_array=${returned_string}"

for junk in "${returned_array[@]}"
do
   echo "$junk"
done

Output is:

"this is junk" is junk
"#more junk and "b@d" characters!" is junk
"!#$^%^&(*)_^&% ^$#@:"<>?/.,\\"'" is junk

/* runLoader.sh */

wait4loader()

{

while(true)

do

     CNT=`ps -ef | grep -v grep | grep -c loader`

    if [ $CNT -ge 16 ]; then     #  이미 지정된 갯수보다 더 많은  프로세스가 동시 실행중이면

          sleep 1;                    #   대기한다.   16= CPU core 수

    else

          break;                     # 적으면 다음 프로세스 추가 실횅을 위해서 loop를 빠져 나간다.

   fi

done

}

loaderTable(0

{

     if [ $TABLE != "X" ] ; then

         loader ... -T $TABLE

     fi

}

for  TABLE in ${TABLES[@]}

do

           TABLE=${TABLE:="X"}

           wait4loader

           loaderTable

done

http://blog.redjini.com/282  참고

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