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How to concatenate stdin and a string?
How to I concatenate stdin to a string, like this?
9 Answers
9
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How to remove an element from an array in Swift
...ant to modify a variable you should use var instead, e.g:
var animals = ["cats", "dogs", "chimps", "moose"]
animals.remove(at: 2) //["cats", "dogs", "moose"]
A non-mutating alternative that will keep the original collection unchanged is to use filter to create a new collection without the eleme...
How to pass the value of a variable to the stdin of a command?
..."$blah"? With that one change (avoiding the many pitfalls in echo's specification, which Stephane's excellent answer goes into in detail at Why is printf better than echo? on Unix & Linux, or which the APPLICATION USAGE section of the echo specification touches on more briefly) it's a perfectly ...
How to read a file into a variable in shell?
...In cross-platform, lowest-common-denominator sh you use:
#!/bin/sh
value=`cat config.txt`
echo "$value"
In bash or zsh, to read a whole file into a variable without invoking cat:
#!/bin/bash
value=$(<config.txt)
echo "$value"
Invoking cat in bash or zsh to slurp a file would be considered a...
How can I write a heredoc to a file in Bash script?
...s an example which will write the contents to a file at /tmp/yourfilehere
cat << EOF > /tmp/yourfilehere
These contents will be written to the file.
This line is indented.
EOF
Note that the final 'EOF' (The LimitString) should not have any whitespace in front of the word, because...
Bash foreach loop
...
Something like this would do:
xargs cat <filenames.txt
The xargs program reads its standard input, and for each line of input runs the cat program with the input lines as argument(s).
If you really want to do this in a loop, you can:
for fn in `cat filen...
Open and write data to text file using Bash?
...
#!/bin/sh
FILE="/path/to/file"
/bin/cat <<EOM >$FILE
text1
text2 # This comment will be inside of the file.
The keyword EOM can be any text, but it must start the line and be alone.
EOM # This will be also inside of the file, see the space in front of...
Printing newlines with print() in R
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An alternative to cat() is writeLines():
> writeLines("File not supplied.\nUsage: ./program F=filename")
File not supplied.
Usage: ./program F=filename
>
An advantage is that you don't have to remember to append a "\n" to the string p...
Why implement interface explicitly?
...p with unused 'orphaned' public methods
strong typing:
To illustrate supercat's story with an example, this would be my preferred sample code, implementing ICloneable explicitly allows Clone() to be strongly typed when you call it directly as a MyObject instance member:
public class MyObject : ICl...
Unix command to prepend text to a file
...
printf '%s\n%s\n' "to be prepended" "$(cat text.txt)" >text.txt
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