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2011-10-01

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 

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