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How to reference a file for variables using Bash?
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If the variables are being generated and not saved to a file you cannot pipe them in into source. The deceptively simple way to do it is this:
some command | xargs
MySQL DROP all tables, ignoring foreign keys
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why not just pipe mysqldump to mysql, without going through a file?
– Rolf
May 28 '18 at 16:40
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Is there a bash command which counts files?
... contain whitespace or special characters such as newlines.
The output is piped to wc -l, which counts the number of lines.
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How to make a node.js application run permanently?
...ode server writes to console.log or console.error it will receive a broken pipe error and crash. This can be avoided by piping the output of your process:
node /srv/www/MyUserAccount/server/server.js > stdout.txt 2> stderr.txt &
If the problem persists then you should look into things ...
Delete all local git branches
...output, this will lead to error: branch 'foo' not found. if you attempt to pipe it into another command. You can bypass this with the --no-color flag to git branch, but who knows what other user configurations might break things.
git branch may do other things that are annoying to parse, like
put a...
Showing the stack trace from a running Python application
... the same thing, except it communicates with the running process through a pipe (to allow for debugging backgrounded processes etc). Its a bit large to post here, but I've added it as a python cookbook recipe.
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How to add a progress bar to a shell script?
...will respond similarly to SIGUSR1. If this facility is available, you can pipe your input through dd to monitor the number of bytes processed.
Alternatively, you can use lsof to obtain the offset of the file's read pointer, and thereby calculate the progress. I've written a command, named pmonito...
How to skip “are you sure Y/N” when deleting files in batch files
...early identical post provides the very useful alternative of using an echo pipe if no force or quiet switch is available. For instance, I think it's the only way to bypass the Y/N prompt in this example.
Echo y|NETDOM COMPUTERNAME WorkComp /Add:Work-Comp
In a general sense you should first look a...
Determine if a function exists in bash
..., but when testing if something is a function, it's slow since you have to pipe to grep or use backticks, both of which spawn a subprocess.
– Lloeki
Dec 19 '13 at 8:46
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Test if executable exists in Python?
...turn subprocess.call("type " + cmd, shell=True,
stdout=subprocess.PIPE, stderr=subprocess.PIPE) == 0
What we're doing here is using the builtin command type and checking the exit code. If there's no such command, type will exit with 1 (or a non-zero status code anyway).
The bit about std...