UNIX for Beginners Questions & Answers

grep -ec 'Exception' -ec 'Fatal' -ec 'Error' -ec 'Exec' log.txt

awk -vKEYS="Exception Fatal Error Exec" '
BEGIN   {for (MX=n=split(KEYS, T); n>0; n--) SRCH[T[n]]
        }
        {for (s in SRCH) if ($0 ~ s) CNT[s]++
        }
END     {for (c in CNT) print c, CNT[c]
        }
' file
Fatal 1
Exec 1
Error 1
Exception 1

#!/usr/bin/env bash

# @(#) s1       Demonstrate count of 4 unique strings, grep, sort, uniq.

# Utility functions: print-as-echo, print-line-with-visual-space, debug.
# export PATH="/usr/local/bin:/usr/bin:/bin"
LC_ALL=C ; LANG=C ; export LC_ALL LANG
pe() { for _i;do printf "%s" "$_i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
em() { pe "$*" >&2 ; }
db() { ( printf " db, ";for _i;do printf "%s" "$_i";done;printf "\n" ) >&2 ; }
db() { : ; }
C=$HOME/bin/context && [ -f $C ] && $C grep sort uniq

FILE=${1-data1}

pl " Input data file $FILE:"
cat $FILE

pl " Results:"
grep -Eo "Exception|Fatal|Error|Exec" $FILE |
tee f1 |
sort |
tee f2 |
uniq -c

exit 0

$ ./s1

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 3.16.0-4-amd64, x86_64
Distribution        : Debian 8.7 (jessie) 
bash GNU bash 4.3.30
grep (GNU grep) 2.20
sort (GNU coreutils) 8.23
uniq (GNU coreutils) 8.23

-----
 Input data file data1:
Now is the time
This is an Exception
for all good men Exec
to come to the aid
Sparkle Farkle Error
of their country.
And now, this: Fatal
Exception, finally.

-----
 Results:
      1 Error
      2 Exception
      1 Exec
      1 Fatal

$ 
$ cat -n logfile.txt
     1    this is line # 1
     2    this is Exception line
     3    this is line # 3
     4    this is Fatal line
     5    this is line # 5
     6    this is Error line
     7    this is Exec line
     8    this is line # 8
     9    this is Error line and Exception line
    10    this is line # 10
    11    this is Exception line
$ 
$ perl -lne '$h{$1}++ while(/(Exception|Fatal|Error|Exec)/g)}{print "$v $k" while(($k,$v)=each %h)' logfile.txt
1 Exec
2 Error
3 Exception
1 Fatal
$ 
$

...
 Input data file data2:
this is line # 1
this is Exception line
this is line # 3
this is Fatal line
this is line # 5
this is Error line
this is Exec line
this is line # 8
this is Error line and Exception line
this is line # 10
this is Exception line

-----
 Results:
      2 Error
      3 Exception
      1 Exec
      1 Fatal