Function in shell script
\nDESCRIPTION:
\nFunction is the piece of code, which executed when we call.
\nWhen thinking about the function in any computer language, three points comes in mind<\/p>\n
1. Writing function code and calling that function when we need
\n 2. Passing arguments to the function
\n 3. Returning value from function<\/p>\n
Next i going to elaborate about the 3 points i mentioned above <\/p>\n
FUNCTION CALL
\nScript shows below describe the simple function call. We should define the function before we using that <\/p>\n
script:
\n #!\/bin\/bash
\n display(){
\n echo “This is inside function definition”
\n }
\n display #calling the display function <\/p>\n
output:
\n This is inside function definition<\/p>\n
PASSING ARGUMENT
\nFollowing scripts pass argument to function and display the argument value.<\/p>\n
script:
\n#!\/bin\/bash<\/p>\n
display_arg(){
\n echo “first argument : $1”
\n echo “second argument : $2”
\n}
\ndisplay_arg “12” “sujin” #passing argument to function<\/p>\n
output:
\nfirst argument : 12
\nsecond argument : sujin<\/p>\n
RETURNING VALUES
\nThis script will shows how function return value to calling function<\/p>\n
script:
\n#!\/bin\/bash<\/p>\n
ret_val(){
\n i=”mystring”
\n echo $i
\n}
\nx=$(ret_val) #passing argument to function
\necho “Returned Value : $x” <\/p>\n
output:
\nReturned Value : mystring<\/p>\n","protected":false},"excerpt":{"rendered":"
Function in shell script DESCRIPTION: Function is the piece of code, which executed when we call. When thinking about the function in any computer language, three points comes in mind<\/p>\n
1. Writing function code and calling that function when we need 2. Passing arguments to the function 3. Returning value from function<\/p>\n
Next i […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[47],"tags":[],"_links":{"self":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/3369"}],"collection":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3369"}],"version-history":[{"count":1,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/3369\/revisions"}],"predecessor-version":[{"id":3370,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/3369\/revisions\/3370"}],"wp:attachment":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3369"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3369"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3369"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}