UNIX for Dummies Questions & Answers

fileset='APP11.txt APP12.txt SPACEDB11.txt WEB11.txt WEB12.txt'

 All Servers:

 
APP11.txt:
APP12.txt:
SPACEDB11.txt:
WEB11.txt:
WEB12.txt:

grep -h "something" file*

cat file* | grep "something"

awk '/something/' file*
sed -n '/something/p' file*

awk '
BEGIN   {for (i=2; i<ARGC; i++) T[ARGV[i]]++}
$0 ~ SP {delete T[FILENAME]}
END     {P = 1
         for (t in T) P = 0
         if (P) print "All servers: "}
' SP="Hello" $fileset

for x in a b c; do echo somestring > $x ;done # for testing
                      
[ `grep -l somestring a b c | wc -l` -eq `ls a b c | wc -l` ]  && echo 'All'
All

awk '
  FNR==1{
    A[f=FILENAME]
  } 
  $0~s{
    F[f]
  } 
  END {
    a=1
    for(f in A)
      if(!(f in F)) {
        a=0
        break
      } 
    if(a) 
      print "All Servers:"
    else
      for(f in F)
        print f ":"
  }
' s=foo file*