UNIX : Using case in shell scripting

The below example shows how to use case statement in bash scripting.

#!/bin/bash

value=123  #We can give the expected value to this variable.

case ${value} in

 2) echo "2";;

 apple) echo "apple";;

 a|b|c) echo "Input value is $val";;

 [Yy][Ee][Ss]) echo "Yes";;

 [5-9]*) echo "A value between 5 and 9 inclusive"

 *) echo "Some other value";;

esac

Comments

UNIX : How to get record count from zipped file

Sometimes we may need to get records count from file . For that we can use wc -l , command with file name. In some situation the file will be in compressed format . wc -l will not directly work with zipped files . In this case we can do zcat the file and pipe the word count command with it. Example : Let say we have a file cricketData.dat.gz To get word count from the file use : zcat cricketData.dat.gz | wc -l This will give the record count.

UNIX : How to ignore lines with certain names

Sometimes we need to ignore multiple lines with certain words and get the list out of the file. usually it will be a log file to read . The below grep command can be used to ignore multiple words present in a text file. Lets say the file contain $ cat list.txt apple orange apple banana papaya Now we need to ignore line with orange , banana and papaya . So we can use the below grep command. $ cat list.txt | grep -Ev "orange|banana|papaya" apple apple It will ignore lines with the words in -v part of grep.

Scala

Scala is a object oriented functional type programing language. All variables declared in scala is considered as objects.

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