Download UNIX Shell Scripting Interview Questions, Answers, and by Terry Sanchez-Clark PDF

By Terry Sanchez-Clark

The last word Reference & studying consultant for the complex UNIX Operator

Fluency with a UNIX Shell is obligatory for operating in the UNIX working approach. conserving present, even if, could be a problem. With the UNIX Shell Scripting Interview consultant, you can be guaranteed to be present. utilizing this e-book to organize for a task interview or brush up on a scripting programming language will relief any programmer in buying new and appropriate abilities and data. This e-book encompasses a whole reference of universal scripting blunders, functionality tuning examples, and customary functions. greater than simply UNIX documentation and open resource rhetoric, this consultant explains UNIX Shell Scripting from the point of view of the complex programmer and administrator so that you may be certain to come to any interview ready.

Key themes include:

• Graphical consumer interfaces for UNIX
• complicated good points of Bash, Bourne, and Korn
• universal error and troubleshooting
• process tracking and maintenance
• sleek command line shells

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They have been tested with care but are not guaranteed for any particular purpose. The publisher does not offer any warranties or representations not does it accept any liabilities with respect to the programs. Trademarks: All trademarks are the property of their respective owners. Equity Press is not associated with any product or vendor mentioned in this book. bar" Question 09 Reading Characters from the Terminal Question 10 Set an Environment Variable Inside Script Question 11 Ring the Terminal Bell During a Shell Script Question 12 Calendar Produce the Wrong Output Question 13 Print Environment Variables Question 14 Welcome Users as They Log-in Question 15 Display Subdirectories Question 16 Difference Between Two Syntax Question 17 Extracting Usernames Question 18 Remove Blanks at the End of String Question 19 Run a Script Question 20 Simple Explanation About xargs Question 21 Get Return Value Question 22 Assistance with Merge Script Question 23 Finding Substrings Question 24 Writing Scripts Question 25 Merging Columns from Different Files Question 26 Remove Duplicate Lines in File Question 27 Reverse and Trim a String Question 28 Transposing Data Question 29 Test for Bad Numbers Question 30 Remove Comma within Quotation Marks INTERMEDIATE QUESTIONS & ANSWERS Question 31 Search and Replace Question 32 “Read in a While” Loop Question 33 Shell Script Functions Question 34 Execute a Script for Each Logout Question 35 Calling Script1 from Inside of Script Question 36 Deleting Lines from a File Question 37 File Size Checking Question 38 Modify Log File Timestamp Question 39 Correct Usage of Input Question 40 First Occurrence of a Timestamp within a File Question 41 Backup Script Question 42 Find Command Exec Error Question 43 Remove the File Extension from File Name Question 44 Retain Blank Spaces Question 45 Hide Password Question 46 Stored Procedure Question 47 Checking Exit Status Question 48 Separating Filenames Question 49 Extract a String Question 50 Splitting a String Question 51 Searching the Line + Next 20 Lines Question 52 Number and Name of Records in a File Question 53 Merging Columns from Different Files Question 54 Formatting a File Question 55 File Comparison Question 56 Include "$" in a String Question 57 Deleting the Empty File Question 58 Copy Script Question 59 Parsing a String in a Shell Script Question 60 Replace All Occurrences of a String Question 61 Replace Character Occurrences Question 62 Passing Parameters to Script Question 63 Schedule Script without Using cron Question 64 Get Current User Question 65 String Substitution Question 66 Read a Specific Line Question 67 Server or Environment Determination Question 68 Timer Question 69 Dynamic Variable Evaluation Question 70 Eliminate Duplicates from a Long List Question 71 Crontab Relative Path Question 72 Security Work Around Question 73 Renaming Multiple Files Question 74 Traverse and Download Question 75 Output a Specific Line in a File Question 76 About Kill Command Question 77 Calling Shell Script with * as a Parameter Question 78 Extract a Section of Text in File Question 79 Run UNIX in a New Shell Inside a Shell Script Question 80 String Replacement Script Question 81 UNIX Script Issues Question 82 Split a Document Question 83 Exit Shell Script from Function Question 84 Search Multiple String Occurrences Question 85 Search/Copy Records ADVANCED QUESTIONS & ANSWERS Question 86 Menu Considerations Question 87 Finding the Last Row Question 88 Catching All Exit Codes Question 89 Converting Text File into XML Question 90 Back Up Log Files Question 91 Stop Simultaneous Execution of the Same Script Question 92 Displaying Script Command with Output Question 93 Build Text File with Calendar Dates Question 94 grep in a Loop Question 95 Generating a List of Choices in a Menu Question 96 Delete Empty Files in a Shell Script Question 97 Replace a Line in a File Question 98 Shrinking a File Question 99 awk in Shell Script Question 100 while Loop Acknowledgements Introduction UNIX shell, also called "the command line," provides the traditional user interface for the UNIX operating system.

Treat it as a black box. It does exactly what it's supposed to if fed the right information. Data file: It contains a list of the various inputs and output files and there are 50 of each. txt Then the final part, which I'm having most trouble with. This is the actual shell that I was hoping would make this all work. /bin/sh program < Data-file < Date-file program < Data-file < Data-file program > Data-file < Data-file (up through 50 times) I want to go sequentially through the data-file and run it on each pair of input/output.

Foreach: The syntax of foreach loop construct is foreach var ( worddlist ) commandlist end The command list is executed once for each word in the wordlist, and each time the variable var will contain the value of that word. For example, the following script can search all immediate subdirectories of the current directory for a given file (and then quit if it finds one): #! /bin/csh -f set f = $1 foreach d (*) if (-e $d/$f) then echo FOUND: $d/$f exit(0) endif end echo $f not found in subdirectories For example, say I call this script FindImm, and my current directory consists of files s, t and u, with s and t being subdirectories, and with t having a file x.

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