Command-line expression evaluator
The expr utility evaluates expressions and writes the result on standard output.
See the FreeBSD Man page.
Questions tagged [expr]
102 questions
0
votes
1 answer
Treat argument as string in Tcl 'expr' statement
I'm using the short syntax of 'if' statement like this:
proc WriteParameter {Parameter Value} {
# Ugly option - WORKS
if {$Parameter eq "Unique"} {
set Register ControlStatus
set Data ${Value}0
set Mask EF
} else…
HardwareEng.
- 99
- 1
- 14
0
votes
2 answers
Error "expr: command not found" in bourne script
I am building a bourne script for a class, and am encountering an issue with this loop. Basically I am building a loop to go through all the files in a specified directory and determine how many files and directories there are as well as how many…
neomang
- 117
- 3
- 10
0
votes
1 answer
unix expr: syntax error
Why is the following expression giving me a expr: syntax error?
pingval=`expr ping6 -c 1 "$url"`
Basically I want to use the value returned by the above expression in another expression e.g.
var=$($pingval|tail -1 ....
Any suggestions?
user3352349
- 177
- 2
- 4
- 16
-1
votes
1 answer
Using shell variable to select awk column identifier
This one works:
temp=($(awk -F" " '$2 == 84' "$1".db))
This one does not (fieldnumber stores the column i wish to search, and val stores the value I'm searching for):
temp=($(awk -F" " -v column="$""$field_number" -v val="$3" '{ if(column == val)…
Dylan Cody
- 3
- 2
-1
votes
1 answer
Tcl lindex and expr: non-numeric failure
If I put only below it works.
"\{[lindex ($columns) 1] - 30.3]"
If I put as below, it doesnt work. Wonder why?
"\{[lindex ($columns) 1] - 30.3] [expr [lindex ($columns) 2] -30.3] \}"
My script as below:
foreach line $lines {
set columns [split…
Kimi
- 43
- 1
- 7
-1
votes
3 answers
How to retrieve the variable name “apple” in "FRUIT=apple" in UNIX shell?
When the user inputs FRUIT=apple in the Unix shell, how can I get the name FRUIT and apple from the input FRUIT=apple separately?
echo -e "\nEnter inputs here: \c"
read inputs
## user input "FRUIT=apple"
Is there any way to get a partial text from…
John Xiating Cai
- 9
- 1
-1
votes
2 answers
tcl expr not rounding like i expect
Im new to tcl and i have these numbers:
set a 565056236086
set b 488193341805
the output of $a / $b is 1,157443552992375
When i use the following code
set num [expr {double(round(100*$a / $b))/100}]
the output is: 1,15
but i want 1.16 how can i…
user1997874
- 33
- 5
-1
votes
1 answer
shell non integer argument in expr error
I wrote the following code in shell script:
num=$1
sum=0; rn=0
less=0; fact=0
while [ $num -gt 0 ]
do
rn=`expr $num % 10`
num=`expr $num / 10`
while [ $rn -gt 1 ]
do
less=`expr %rn - 1`
fact=`expr $rn \* less`
rn=`expr $rn - 1`
done
sum=`expr $sum…
Richi Dubey
- 89
- 12
-1
votes
1 answer
Downloading basic Linux commands
I have a basic Linux distribution on a router. I'd like to install libmodbus to handle some modbus controls locally. However, the Linux distribution lacks the expr command. When I run ./configure to install the package, I get a bunch of errors like:…
Lost Puppy
- 19
- 6
-1
votes
2 answers
Unix Shell Scripting - expr syntax issue
I am trying to find total size of a current directory and the shell script is failing at expr command. below is my code:
#!/bin/sh
echo "This program summarizes the space size of current directory"
sum=0
for filename in *.sh
do
fsize=`du -b…
Ravi
- 163
- 1
- 2
- 12
-1
votes
1 answer
How do I convert a calculated field in crystal reports into an SSRS expression?
I have a calculated field in crystal reports, which I need to convert it to an SSRS expression. Any help would be appreciated.
If ({VISIT_TYPE.DESCRIPTION} = "New" or {VISIT_TYPE.DESCRIPTION} = "Walk-In New") then
if {ATTEND_STATUS.DESCRIPTION}…
Devesh Sharma
- 25
- 1
- 7
-2
votes
2 answers
Add 1-10 minutes on every column of a file and file have n number of times
i have a time file like this
time.log
12:30
13:10
16:00
and i want to redirect this file in this…
