Linux Shell script example 1
A example in BASH is as follows to display welcome message 5 times with for loop. #!/bin/bash for i in 1 2 3 4 5 do echo “Welcome $i times” done
Linux shell script – for loop using ranges or counting
Linux shell script – for loop using ranges or counting The for loop can be set using the numerical range. The range is specified by a beginning and ending number. The for loop executes a sequence of commands for each member in a list of items. A representative example in BASH is as follows to … Read more
Shell Script Example – Linux
Shell Script Example – Linux for ((j=12;j<=31;j++)); do echo $j year=2020 month=01 day=$j mkdir /mnt/recording/final/11/$year-$month-$day results=($(mysql –user name -ppassword -h 192.168.2.4 db -Bse “SELECT id FROM calldetails WHERE calldate BETWEEN ‘$year-$month-$day 00:00:00’ AND ‘$year-$month-$day 23:00:00′”)) cnt=${#results[@]} for (( i=0 ; i<cnt ; i++ )) do a=${results[$i]} echo auid=$a; cp /home/data/$year-$month-$day/$a.gsm /mnt/recording/final/11/$year-$month-$day/$a.gsm done done
Shell Script : Nested for loop statement
Shell Script : Nested for loop statement Nested for loops means loop within loop. They are useful for when you want to repeat something serveral times for several things. For example, create a shell script called nestedforloop.sh: #!/bin/bash # A shell script to print each number five times. for (( i = 1; i <= … Read more
C – If..else, Nested If..else and else..if Statement
C If else statement Syntax of if else statement: If condition returns true then the statements inside the body of “if” are executed and the statements inside body of “else” are skipped. If condition returns false then the statements inside the body of “if” are skipped and the statements in “else” are executed. if(condition) { … Read more
If statement in C programming
When we need to execute a block of statements only when a given condition is true then we use if statement. In the next tutorial, we will learn C if..else, nested if..else and else..if. C – If statement Syntax of if statement: The statements inside the body of “if” only execute if the given condition … Read more
Operator precedence and Associativity in C programming language
Operator Precedence in C Operator precedence determines which operator is evaluated first when an expression has more than one operators. For example 100-2*30 would yield 40, because it is evaluated as 100 – (2*30) and not (100-2)*30. The reason is that multiplication * has higher precedence than subtraction(-). Associativity in C Associativity is used when … Read more
C Keywords – Reserved Words
In C, we have 32 keywords, which have their predefined meaning and cannot be used as a variable name. These words are also known as “reserved words”. It is good practice to avoid using these keywords as variable name. These are – “auto, break, case, char, const, continue, double, default, do, else, enum, exturn, float, … Read more
Rename Multiple Files In Linux using mmv command
Rename Multiple Files In Linux using mmv command mmv moves (or copies, appends, or links, as specified) each source file matching a from pattern to the target name specified by the to pattern. yum install mmv Let us say, you have the following files in your current directory. $ ls a1.txt a2.txt a3.txt Now you want … Read more
asterisk: sip remove header
asterisk: sip remove header SIPRemoveHeader() Synopsis Remove SIP headers previously added with SIPAddHeader Description SIPRemoveHeader() allows you to remove headers which were previously added with SIPAddHeader(). If no parameter is supplied, all previously added headers will be removed. If a parameter is supplied, only the matching headers will be removed. For example you have added … Read more