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
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vote
0 answers
Using expr to extract an IP from a URL
On, Mac OS X I'm trying to use expr to extract an IP address from a URL string.
expr tcp://192.168.59.103:2376 : '^\([0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\)'
This returns an empty string.
MoxieandMore
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0
votes
1 answer
Track the historical change of Status
I defined the folloing Expr Formula:
history.changes.Filter($.field="status").changeGroup.map(CONCAT($.author.user_display_name(), " set on ", FORMAT_DATETIME($.timestamp, ""yyy-MM-dd HH:mm:ss")))
to figure out who, when has changed the Status.…
And_R
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0
votes
1 answer
How to multiply decimals using expr
When I run the following command:
expr 1.2 * 13
I get this error:
expr: syntax error: unexpected argument '12'
I expect I am missing a syntax. What is it?
Allan Xu
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0
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0 answers
I am getting expr syntax errors for a simple equations
here is the code:
lidarachynska@MacBook-Air-Lida ~ % cd rachynska
lidarachynska@MacBook-Air-Lida rachynska % vim bin/com2
lidarachynska@MacBook-Air-Lida rachynska % chmod a+x bin/com2
lidarachynska@MacBook-Air-Lida rachynska %…
Korostev
- 3
- 2
0
votes
1 answer
How to multiply series of numbers using expr in bash
I was trying to get the factorial of a number in bash,it's an easy program obviously ,using loop I can do this,for example
#!/usr/bin/bash
echo "Enter number"
read number
#echo `seq -s "*" 1 $number | bc`
result=1
for((i=1;i<=number;i++))
…
0
votes
1 answer
Double variable substitution in tcl
I am getting an error invalid character "." while running following code in tcl shell :
set var "p.txt_bc"
set p.txt_bc 1
expr $$var
invalid character "." in expression "$p.txt_bc"
How to handle the "." character here so that the output is 1 ?
I…
Abhishek
- 1
0
votes
1 answer
Matching a regex containing variable environment in RewriteCond of .htaccess
The goal here is if the URL has got a trailing slash, like h2tps://domain.com/page/, redirect to h2tps://domain.com/page
h2tp(s)://(www.)domaine.com/page/ => h2tps://domain.com/page
It should work only in prod environment, not dev, it's why the…
Cyril
- 177
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- 7
0
votes
1 answer
pyspark add int column to a fixed date
I have a fixed date "2000/01/01" and a dataframe:
data1 = [{'index':1,'offset':50}]
data_p = sc.parallelize(data1)
df = spark.createDataFrame(data_p)
I want to create a new column by adding the offset column to this fixed date
I tried different…
NewPy
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0
votes
1 answer
How to filter field in array in MongoDB
I have array:
{'_id': ObjectId('7262718c217dda3ad90ef151'), 'SomeText': "aaa", 'items': [{'status': 500, 'x': 1, 'y': None, 'price': 3}, { 'status': 500, 'x': 2, 'y': None, 'price': 4}]}
{'_id': ObjectId('7262718c217dda3ad90ef152'), 'SomeText':…
GreatFilter
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- 4
0
votes
0 answers
exp attribute in replicate function in R is not working
I want to replicate an expression using the replicate function in R. The expression is a multiplication containing lnorm distribution. The expression gives different results outside the replication function but when I insert it as an attribute into…
MariaK
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- 1
0
votes
1 answer
Why do I get a syntax error when using expr in bash（MacOS）？
I'm just starting to learn shell, and I felt really puzzled when I got a syntax error in this simple code :
str="Hello world!"
echo $(expr length "$str")
But this code can work on Ubantu actually. Is it because my bash version is outdated? Or is it…
StaY_Hungry
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0
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3 answers
I need to insert the output of the count, incremented from a loop 'for' within a varyable 'list' in TCL
I want to list the increments in "$ i" of the loop for variable in '[list ]' mode. For then, I could calculate the values with '[expr ]'.
I will leave here a didactic example, to simplify the idea. To look:
set i 1
while {$i <= 9} {
global value
…
Diego Henrique
- 255
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0
votes
1 answer
Gurobi QuadExpr : what should I change to y.value
for i in P:
S=(y[i]-R*p[i])*(y[i]-R*p[i])/(p[i]*p[i])
print(S)
When I run the above program, the output is as below. How should I change it?
I want to output y (i) to calculate the value.
炎天下修羅
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0
votes
1 answer
Using variable in expression with Nullif fails
I'm using the code below to convert an empty string to Null.
I don't get an error but it remains an empty string.
I suspect an incorrect use of the variable col_name in expr
for col_name in ['col1', 'col2']:
df_new = df \
…
John Doe
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0
votes
1 answer
How to compute exponentiation and roots in the shell?
I'm a beginner in shell and linux in general, it's a Shell Arithmetic question and I can't figure out what to write in terminal to solve these three equations. I'm sorry if it seems a bad question, I tried echo command and expr, but all of them are…
James1970
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