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CONDITIONAL SEQUENCES SYNTAX: ON SUCCESS commandi & & command2 ON FAILURE commandi || command2 EXERCISE: 1.Display the output, if the compilation of a program succeeds 2.Display an error message, if the compilation of a program fails NOTE: AIl built-in shell commands returns1(0) if they fail(succeed)

CONDITIONAL SEQUENCES SYNTAX: ON SUCCESS commandi & & command2 ON FAILURE commandi || command2 EXERCISE: 1.Display the output, if the compilation of a program succeeds 2.Display an error message, if the compilation of a program fails NOTE: AIl built-in shell commands returns1(0) if they fail(succeed)

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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6. CONDITIONAL SEQUENCES SYNTAX: ON SUCCESS commandi & & command2 ON FAILURE commandi ||command2 EXERCISE: 1.Display the output, if the compilation of a program succeeds 2.0isplay an error message, if the compilation of a program fails NOTE: AII built-in shell commands returns1(0) if they fail(succeed) 7. GROUPING COMMANDS SYNTAX: (command1; command2; command3.) EXERCISE: 1.Repeat exercise 5.2, but, redirect the output to the same file. NOTE: Grouping the commands causes them to be executed by a child shell and the group may be redirected or piped as if it were a simple command 8. BACKGROUND PROCESSING SYNTAX: command & EXERCISE: 1.Run a command/ exe file in background by redirecting its input and output NOTE: Background processing is very useful in performing several tasks simultaneously as long as background tasks do not require standard input and output 9. SHELL PROGRAMS: SCRIPTS SYNTAX: scriptname EXERCISE: 1.Write a script to include n different commands NOTE: A file that contains shell commands is called a script. Before a script can be run, it must be given execute permission by using chmod utility (chmod +x script). To run the script, only type its name. They are useful for strong commonly used sequences of commands to full-blown programs.
Transcribed Image Text:6. CONDITIONAL SEQUENCES SYNTAX: ON SUCCESS commandi & & command2 ON FAILURE commandi ||command2 EXERCISE: 1.Display the output, if the compilation of a program succeeds 2.0isplay an error message, if the compilation of a program fails NOTE: AII built-in shell commands returns1(0) if they fail(succeed) 7. GROUPING COMMANDS SYNTAX: (command1; command2; command3.) EXERCISE: 1.Repeat exercise 5.2, but, redirect the output to the same file. NOTE: Grouping the commands causes them to be executed by a child shell and the group may be redirected or piped as if it were a simple command 8. BACKGROUND PROCESSING SYNTAX: command & EXERCISE: 1.Run a command/ exe file in background by redirecting its input and output NOTE: Background processing is very useful in performing several tasks simultaneously as long as background tasks do not require standard input and output 9. SHELL PROGRAMS: SCRIPTS SYNTAX: scriptname EXERCISE: 1.Write a script to include n different commands NOTE: A file that contains shell commands is called a script. Before a script can be run, it must be given execute permission by using chmod utility (chmod +x script). To run the script, only type its name. They are useful for strong commonly used sequences of commands to full-blown programs.
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