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Pipe output and capture exit status in Bash
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@DaveKennedy: Dumb as in "obvious, not requiring intricate knowledge of bash syntax"
– EFraim
Mar 2 '16 at 18:18
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How to append output to the end of a text file
...reated.
Example:
$ echo "hello" > file
$ echo "world" >> file
$ cat file
hello
world
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Linux command (like cat) to read a specified quantity of characters
Is there a command like cat in linux which can return a specified quantity of characters from a file?
9 Answers
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Read user input inside a loop
...he regular stdin through unit 3 to keep the get it inside the pipeline:
{ cat notify-finished | while read line; do
read -u 3 input
echo "$input"
done; } 3<&0
BTW, if you really are using cat this way, replace it with a redirect and things become even easier:
while read line; do
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Backup/Restore a dockerized PostgreSQL database
...stgres > dump_`date +%d-%m-%Y"_"%H_%M_%S`.sql
Restore your databases
cat your_dump.sql | docker exec -i your-db-container psql -U postgres
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Changing the selected option of an HTML Select element
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break;
}
}
}
<select id="sel">
<option>Cat</option>
<option>Dog</option>
<option>Fish</option>
</select>
<button id="btn">Select Fish</button>
jQuery
But if you really want to use jQuery:
var val...
Append file contents to the bottom of existing file in Bash [duplicate]
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This should work:
cat "$API" >> "$CONFIG"
You need to use the >> operator to append to a file. Redirecting with > causes the file to be overwritten. (truncated).
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How to get the command line args passed to a running process on unix/linux systems?
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There are several options:
ps -fp <pid>
cat /proc/<pid>/cmdline | sed -e "s/\x00/ /g"; echo
There is more info in /proc/<pid> on Linux, just have a look.
On other Unixes things might be different. The ps command will work everywhere, the /proc stuff ...
Apply multiple functions to multiple groupby columns
... second half of the currently accepted answer is outdated and has two deprecations. First and most important, you can no longer pass a dictionary of dictionaries to the agg groupby method. Second, never use .ix.
If you desire to work with two separate columns at the same time I would suggest using ...
Count occurrences of a char in plain text file
...rep -o f <file> | wc -l
Note: Besides much easier to remember/duplicate and customize, this is about three times (sorry, edit! botched the first test) faster than Vereb's answer.
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