add four shell scripts

Author: vaankiller

shell/file.txt

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+name age
+alice 21
+ryan 30

shell/filter_number.sh

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+#!/bin/sh
+
+cat file.txt | egrep "^(\([0-9]{3}\)\s|[0-9]{3}-)[0-9]{3}-[0-9]{4}$"
+
+# Tips : cat file.txt | egrep "(\([0-9]{3}\)\s|[0-9]{3}-)[0-9]{3}-[0-9]{4}"
+# [[:anything:]] is in shell regex

shell/print_10th_line.sh

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+#!/bin/sh 
+
+count=0
+
+while read line
+do
+	count=`expr $count + 1`
+	if [ $count -eq 10 ]
+	then
+		echo $line
+	fi
+done < ./file.txt
+
+# Tips:
+# use while loop, because for loop ifs will be "space"",\n,...
+# airthmetic in shell use expr, in if condition ues -eq not ==
+# read file in shell 

shell/transpose_file.sh

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+#!/bin/sh
+
+COL=$(cat file.txt | head -n 1 | wc -w)
+LINE=$(cat file.txt | wc -l)
+
+#echo $COL
+#echo $LINE
+cat file.txt | awk -v line=$LINE \
+	'BEGIN{ for(i=1;i<=2;i++) 
+			{
+				printf $i; 
+			}
+		}'
+
+
+		awk '  
+		{
+
+			for(i=1;i<=NF;i++){
+
+				if(NR==1){
+
+					s[i]=$i;  
+				}else{
+
+				s[i]=s[i]" "$i;  
+			}  
+		}  
+	}    
+	END{
+
+	for(i=1;s[i]!="";i++)  
+		print s[i];  
+	}  
+	' file.txt'