10-05-2018
You have a read command at the start of your script and you have a read command inside your loop. Every read command will wait for you to type in a response.
Try replacing the first read with an echo or printf that gives the directions for the data to be entered and let the read command inside the loop be the only command that blocks waiting for data to be entered.
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greetings,
I have a script that is taking input like this:
a
b
c
d
aa
bb
aaa
bbb
ccc
ddd
and formating it to be like this:
a b c d
aa bb
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I'm trying to run the logic below but get a `<' is not matched error message when I return a Y or y;
printf "Run this ? : "
read RESP
case $RESP in
Y|y)
cat <<EOF > file
today is Monday
EOF ;;
N|n)
exit 1 ;;
esac
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i want to get user input like this
please tell which option to chose
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i want to get user input like this
please tell which option to chose
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I was trying to write a simple script which will read a text file and count the number of vowels in the file. My code is given below -
#!/bin/bash
file=$1
v=0
if
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"--"|"--""-")
"--""-"")
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do
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Using BASH:
$ if -- ::00" ]]; then echo "true"; else echo "false"; fi
false
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Hi Gurus,
I have the below BASH code which does not works for upper case alphabets except Z (upper case Z).
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)
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;;
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Hi,
I have a script below that is running ssh <host> <command> on some servers.
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check_log.bash
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#
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while(n) Tcl Built-In Commands while(n)
__________________________________________________________________________________________________________________________________________________
NAME
while - Execute script repeatedly as long as a condition is met
SYNOPSIS
while test body
_________________________________________________________________
DESCRIPTION
The while command evaluates test as an expression (in the same way that expr evaluates its argument). The value of the expression must a
proper boolean value; if it is a true value then body is executed by passing it to the Tcl interpreter. Once body has been executed then
test is evaluated again, and the process repeats until eventually test evaluates to a false boolean value. Continue commands may be exe-
cuted inside body to terminate the current iteration of the loop, and break commands may be executed inside body to cause immediate termi-
nation of the while command. The while command always returns an empty string.
Note: test should almost always be enclosed in braces. If not, variable substitutions will be made before the while command starts execut-
ing, which means that variable changes made by the loop body will not be considered in the expression. This is likely to result in an
infinite loop. If test is enclosed in braces, variable substitutions are delayed until the expression is evaluated (before each loop iter-
ation), so changes in the variables will be visible. For an example, try the following script with and without the braces around $x<10:
set x 0
while {$x<10} {
puts "x is $x"
incr x
}
EXAMPLE
Read lines from a channel until we get to the end of the stream, and print them out with a line-number prepended:
set lineCount 0
while {[gets $chan line] >= 0} {
puts "[incr lineCount]: $line"
}
SEE ALSO
break(n), continue(n), for(n), foreach(n)
KEYWORDS
boolean value, loop, test, while
Tcl while(n)