Could an until loop sometimes never execute

Assignment Help Computer Engineering

Reference no: EM1336598

Give brief answers for the following questions.

1. Can an until loop sometimes never execute?

2. Will the following script execute with no errors?

#!/bin/csh
for I
do
echo $I
done

3. Does the following script print to standard output, a list of numbers equal to the number passed on the command line?

#!/bin/sh

count=$1

index=1
while [ "0$index" -le $count ]
do
echo $index
index=`expr "$index" + 1`
done

4. Will the following statement print 'I am glad this class is over' to standard output if the shell variable XYZ is NULL or not set?

: ${XYZ:?"I am glad this class is over"}

5. After the statement

: ${VISUAL:=vi}

will the value of the shell variable VISUAL always be vi?

6. Will the following command execute:

${VISUAL:+vi} ls

the command 'ls' if the shell variable VISUAL is not set or null?

7. Will the following commands send to the line printer all files whose contents contain the text '/bin/sh' if the command to print is lpr ?

MATCH=`grep -l '/bin/sh' *`
lpr ${MATCH?"NO files found"}

Reference no: EM1336598

Questions Cloud

Write down a shell script to send a customized : Write down a shell script to send a customized mail message to the users listed on the command line by login (user) name, only if they are currently logged on. If no users are listed on the command line, an error message should be printed.

Lucidate what will happen to the economy in the short run : If the government decides to intervene to return the economy to full employment, elucidate what will happen to the economy in the short run and in the long run.

Explain important information about marketing discussion : Explain Important information about Marketing Discussion and Most discussions of marketing strategy focus on large businesses like Procter and Gamble

Forecast the next period using simple exponential smoothing : Calculate the forecast for the next period using simple exponential smoothing.

Could an until loop sometimes never execute : could an until loop sometimes never execute.

Utlizing the aggregate demand and aggregate supply : Utlizing the aggregate demand and aggregate supply model, draw an economy in a boom.

Concept of victim precipitation supported by evidence : Why is the concept of victim precipitation so controversial? Do you feel the concept is adequately supported by evidence?

Suppose the script ran under the bourne shell : suppose the script ran under the Bourne shell.

Explain marketing mix impact the marketing strategy : Explain Marketing mix and explain how the elements (product, place, price, and promotion) of the marketing mix impact the development of the organization's marketing strategy and tactics

User Account

All Pages