Sh Cheat Sheet

#File:ShCheatSheet.sh v.1.1.0 docs at the end 

#source:http://www.dartmouth.edu/~rc/classes/ksh/index.html#for loop example

for file in * ; do echo Processing $file ; done ; 

for file in  `ls -1` ; do echo Processing $file ; done ; 

#if example 

if [ -r $myfile ]

then

   cat $myfile

else

   echo $myfile not readable

fi

#case example 

case $filename in

*.dat)

echo Processing a .dat file

;;

*.sas)

echo Processing a .sas file

;;

*)

# catch anything else that doesn't match patterns

echo "Don't know how to deal with $filename"

;;

esac

*

Matches any zero or more characters. 

?

Matches any one character. 

[string]

Matches exactly one character that is a member of the string string. This is called a character class. As a shorthand, string may contain ranges, which consist of two characters with a dash between them. For example, the class ‘[a-z0-9_]’ matches a lowercase letter, a number, or an underscore. You can negate a class by placing a ‘!’ or ‘^’ immediately after the opening bracket. Thus, ‘[^A-Z@]’ matches any character except an uppercase letter or an at sign. 

\

Removes the special meaning of the character that follows it. This works even in character classes.

# while example 

count=0

max=10

while [[ $count -lt $max ]] ; do 

  echo $count ; 

  count=$((count + 1)) ; 

done ; 

echo "Value of count after loop is: $count"

wlog(){

        echo "`date +%Y.%m.%d-%H:%M:%S` [$$] $*" >> $LOGFILE

        test -t 1 && echo "$*"

}

send_mail(){

        # $1 = subject

        # $* = recipients

        # - = text

        test -z "$2" && {

                wlog "NOTICE: no mail recipients"

                return 0

        }

        _sm_s="$1"

        shift 1

        mailx -s "$_sm_s" $* || {

                wlog "ERROR: Failed to send mail to $*"

                return 1

        }

        return 0

}

#get a nice date

`date +%Y%m%d%H%M%S`

outgoing_dirs=`find $ROOTDIR -type d -name 'outgoing'`

for odir in $outgoing_dirs

do

        test -d "$odir" || continue

        find $odir -type f -mtime $MAXAGE -print0 | xargs --null -r $debug rm

done

#The ultimate find in files 

DirToSearch=/var/log/

FilesToSearch=`ls -rt $DirToSearch`

for file in $FilesToSearch

do

        file=$DirToSearch/$file

        test -f "$file" || continue 

        grep -nH 'sekauppi' $file  

done

find $DirToSearch -type f -exec grep -nH 'yogeorgi' {} \; | less 

today=`date +%Y%m%d`

yesterday=`date --date yesterday +%Y%m%d`

Help(){

        cat<<EOF

`basename $0` [-t filetype] [-f srcfile] [-o outfile] [-D outdir]

        [-u owner] [-g group] [-U srcurl] [-d day -d day2 ...]

        [-F] [-b daysback]

        filetype:       {userlist | auditlog}

        user:           $channel_user

        srcurl:         $BASE_URL

        daysback:       $DAYS_BACK

        -F to force download even if file was downloaded already

EOF

#Purpose: 

# Provide an easy copy paste resource for sh programming

# VersionHistory: 

# 1.1.0 --- ysg --- Updated docs , published 

# 1.0.0 --- ysg --- Initial version , see main source