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Bash script processing limited number of commands in parallel
...ait until the child process specified by each process ID pid or job specification jobspec exits and return the exit status of the last
command waited for. If a job spec is given, all processes in the job
are waited for. If no arguments are given, all currently active child
processes are waited...
How to assign the output of a command to a Makefile variable
...R=$(shell echo whatever)
me@Zack:~$make
MY_VAR IS whatever
me@Zack:~$ cat Makefile
MY_VAR := $(shell echo whatever)
all:
@echo MY_VAR IS $(MY_VAR)
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What is the difference between static func and class func in Swift?
...c identity() -> String {
// return "I'm once a dog but now I'm a cat"
// }
// Can not override a "class func", but redeclare is ok
func talk() -> String {
return "I'm a bulldog, and I don't woof."
}
// Same as "class func"
func eat() -> String {
...
How to convert a string to integer in C?
... wrong as unsafe. atoi() works if input is valid. But what if you do atoi("cat")? strtol() has defined behavior if the value cannot be represented as a long, atoi() does not.
– Daniel B.
Jul 22 '15 at 19:13
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How to make HTML table cell editable?
...e one of the following values:
true or the empty string, which indicates that the element must be editable;
false, which indicates that the element must not be editable.
If this attribute is not set, its default value is inherited from its
parent element.
This attribute is a...
Passing command line arguments to R CMD BATCH
...st.Rout, will show that the argument 4 has been successfully passed to R:
cat test.Rout
> args <- commandArgs(trailingOnly = F)
> myargument <- args[length(args)]
> myargument <- sub("-","",myargument)
> print(myargument)
[1] "4"
> q(save="no")
> proc.time()
user system...
DistutilsOptionError: must supply either home or prefix/exec-prefix — not both
...still install into the target directory. My issue was additionally complicated because i installed python3 as well, but +1 for the virtualenv solution.
– Josh Brown
May 1 '18 at 18:37
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How to urlencode data for curl command?
...part should begin with a name followed by a separator and a content specification.
Example usage:
curl \
--data-urlencode "paramName=value" \
--data-urlencode "secondParam=value" \
http://example.com
See the man page for more info.
This requires curl 7.18.0 or newer (released Janua...
Wget output document and headers to STDOUT
...Note the trailing -. This is part of the normal command argument for -O to cat out to a file, but since we don't use > to direct to a file, it goes out to the shell. You can use -qO- or -qO -.
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What does $@ mean in a shell script?
...e scope a function), it expands to the arguments passed to such script.
$ cat my-sh
#! /bin/sh
echo "$@"
$ ./my-sh "Hi!"
Hi!
$ put () ( echo "$@" )
$ put "Hi!"
Hi!
Word splitting.
Now, another topic that is of paramount importance when understanding how $@ behaves in the shell is word split...