bash one-liners: grep, sed, awk, find

#READ ARGS IN CMD LINE:
for arg in $@
do
    printf $arg
done
 
#READ LINES OF A FILE
while read line; do 
    printf $line
done < in.txt
 
#FIND MIN, MAX, AVERAGE USING AWK
awk 'NR == 1 { max=$1; min=$1; sum=0 } { if ($1>max) max=$1; if ($1<min) min=$1; sum+=$1;} END {if(NR>0) printf "%d,%d,%d", min, max, sum/NR}'
 
 
#COUNT OF EACH UNIQ ITEM
sort| uniq -c
 
sed 's/:/ /g'
 
grep -v 'patt' file
 
#!/bin/sh
 
for filename in /tmp/*
do
  echo $filename
done;
 
 
awk '{ sum += $6 } END { print sum }' filename 
awk '{sub(/[ \t]+$/, "");print}' filename 
awk '/Dog/,/Cat/' filename 
awk '/virtual/{n++}; END {print n+0}' filename 
awk '{print FNR "\t" $0}' files*
 
#Convert Windows/DOS newlines (CRLF) to Unix newlines (LF) from Unix
awk '{ sub(/\r$/,""); print }'
#Convert Unix newlines (LF) to Windows/DOS newlines (CRLF) from Unix
awk '{ sub(/$/,"\r"); print }'
#Print the sum of fields in every line
awk '{ s = 0; for (i = 1; i <= NF; i++) s = s+$i; print s }'
#Print the sum of fields in all lines
awk '{ for (i = 1; i <= NF; i++) s = s+$i }; END { print s+0 }'
sed -n '45,50p' filename           # print line nos. 45-50 of a file
 
#Calculate total size of a directory in Mb
 
ls –al |awk '{total +=$5};END {print "Total size: " total/1024/1024 " Mb"}'
 
 
#find examples
find . -name '*OR*.xls' -exec du '{}' \;
#Finding the Top 5 Big Files
find . -type f -exec ls -s {} \; | sort -n -r | head -5
#Find all directories
find . -type d
#Find files bigger than the given size
# find ~ -size +100M