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Full Discussion: Syntax for if statement
Top Forums UNIX for Beginners Questions & Answers Syntax for if statement Post 303040285 by Eric7giants on Saturday 26th of October 2019 12:02:30 AM
Old 10-26-2019
Syntax for if statement

I'm new to unix and the command line and am trying to learn different commands. I have a file (teledir.txt) that contains a name and phone number for 3 different people. I am writing a script that is to take two positional parameters and I typed out how it should behave:


Code:
if <name and number exists>; then
     <echo matching line>
elif <name exists>; then
     <echo line>
elif <number exists>; then
     <echo matching line>; then
else 

     <if both name and number were provided, add them to the file>
fi

I declared two variables: name=$1 and number=$2. But I'm lost on what command to use in the script to see if the name and/or number exists in the other file.

Any pointers?

Moderator's Comments:
Mod Comment Yes.... watch this video on how to use code tags:


Last edited by Neo; 10-26-2019 at 01:20 AM.. Reason: Code Tags Please See YT Video on this: https://youtu.be/4BuPvWJV__k
 

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XMLIF(1)							       xmlif								  XMLIF(1)

NAME
xmlif - conditional processing instructions for XML SYNOPSIS
xmlif [attrib=value...] DESCRIPTION
xmlif filters XML according to conditionalizing markup. This can be useful for formatting one of several versions of an XML document depending on conditions passed to the command. Attribute/value pairs from the command line are matched against the attributes associated with certain processing instructions in the document. The instructions are <?xmlif if?> and its inverse <?xmlif if not?>, <?xmlif elif?> and its inverse <?xmlif elif not?>, <?xmlif else?>, and <?xmlif fi?>. Argument/value pairs given on the command line are checked against the value of corresponding attributes in the conditional processing instructions. An `attribute match' happens if an attribute occurs in both the command-line arguments and the tag, and the values match. An `attribute mismatch' happens if an attribute occurs in both the command-line arguments and the tag, but the values do not match. Spans between <?xmlif if?> or <?xmlif elif?> and the next conditional processing instruction at the same nesting level are passed through unaltered if there is at least one attribute match and no attribute mismatch; spans between <?xmlif if not?> and <?xmlif elif not?> and the next conditional processing instruction are passed otherwise. Spans between <?xmlif else?> and the next conditional-processing tag are passed through only if no previous span at the same level has been passed through. <?xmlif if?> and <?xmlif fi?> (and their `not' variants) change the current nesting level; <?xmlif else?> and <?xmlif elif?> do not. All these processing instructions will be removed from the output produced. Aside from the conditionalization, all other input is passed through untouched; in particular, entity references are not resolved. Value matching is by string equality, except that "|" in an attribute value is interpreted as an alternation character. Thus, saying foo='red|blue' on the command line enables conditions red and blue. Saying color='black|white' in a tag matches command-line conditions color='black' and color='white'. Here is an example: Always issue this text. <?xmlif if condition='html'?> Issue this text if 'condition=html' is given on the command line. <?xmlif elif condition='pdf|ps'?> Issue this text if 'condition=pdf' or 'condition=ps' is given on the command line. <?xmlif else?> Otherwise issue this text. <?xmlif fi?> Always issue this text. AUTHOR
Eric S. Raymond <esr@snark.thyrsus.com> Author of xmlif program Linux April 2009 XMLIF(1)
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