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Query EC2 tags from within instance
...e | cut -f5
And to get only the value for the tag that I filtered on, we pipe to cut and get the fifth field.
ec2-describe-tags \
--region \
$(curl -s http://169.254.169.254/latest/meta-data/placement/availability-zone | sed -e "s/.$//") \
--filter \
resource-id=$(curl --silent http:...
How do I get cURL to not show the progress bar?
...om > temp.html
This works for both redirected output > /some/file, piped output | less and outputting directly to the terminal for me.
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How to define hash tables in Bash?
...mporary file, one-per line, then use 'grep "^$key"' to get them out, using pipes with cut or awk or sed or whatever to retrieve the values.
Like I said, it sounds terrible, and it sounds like it ought to be slow and do all sorts of unnecessary IO, but in practice it is very fast (disk cache is awes...
Function return value in PowerShell
...$a
return
The $a variable in the second example is left as output on the pipeline and, as mentioned, all output is returned. In fact, in the second example you could omit the return entirely and you would get the same behavior (the return would be implied as the function naturally completes and ex...
VIM + JSLint?
...
Much better is to pipe the results through Lynx to deal with JSLint's unfortunate choice of HTML for output format. I have a blog post on how to do it here:
http://www.fleegix.org/articles/2008-09-06-jslint-in-vim-through-lynx
...
How to split a dos path into its components in Python
...g the data back from the other program? Are you reading it from a file, a pipe, a socket? If so, then you don't need to do anything fancy; the only reason for doubling backslashes or using raw strings is to place string constants into Python code. On the other hand, if the other program is genera...
How to use SSH to run a local shell script on a remote machine?
...
Not certain but can't you pipe your script on hostA to run on hostB using this method?
– nevets1219
Apr 28 '10 at 21:13
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How do you take a git diff file, and apply it to a local branch that is a copy of the same repositor
...tion of apply that tries to merge in the changes.
It also works with Unix pipe as follows:
git diff d892531 815a3b5 | git apply
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How can I have ruby logger log output to stdout as well as file?
...r those who like it simple:
log = Logger.new("| tee test.log") # note the pipe ( '|' )
log.info "hi" # will log to both STDOUT and test.log
source
Or print the message in the Logger formatter:
log = Logger.new("test.log")
log.formatter = proc do |severity, datetime, progname, msg|
puts msg
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How does a Linux/Unix Bash script know its own PID?
...vanced Bash Scripting Guide referenced by Jefromi, these examples show how pipes create subshells:
$ echo $$ $BASHPID | cat -
11656 31528
$ echo $$ $BASHPID
11656 11656
$ echo $$ | while read line; do echo $line $$ $BASHPID; done
11656 11656 31497
$ while read line; do echo $line $$ $BASHPID; done ...