Menu
I'd like to add some simple text into some files. Specifically, I do this on Linux lpfc drivers:
ls -1 /sys/class/scsi_host/host* | awk -F '@' '{system("echo 0x0 > "$1"/lpfc_log_verbose")}'
But thinking about common case I need to handle spaces in file names. Thus I turned to find:
find -L /sys/class/scsi_host -nowarn -maxdepth 2 -type f -name 'lpfc_log_verbose' -exec echo 0x0 > {} \; 2>/dev/null
But this seems not working.
find -L /sys/class/scsi_host -maxdepth 2 -type f -name 'lpfc_log_verbose' -exec cat {} \; 2>/dev/null
is fine but shows my edit didn't success. So can we use redirect in find -exec? What is the correct work-around?
220
To search multiple files with the grep command, insert the filenames you want to search, separated with a space character. The terminal prints the name of every file that contains the matching lines, and the actual lines that include the required string of characters. You can append as many filenames as needed.
Here is a quick command that you can use to search and replace a piece of text across multiple files using find, xargs, and sed.
Use the echo command, used with the append redirection operator, to add a single line of text to a file. This adds the message Remember to back up mail files by end of week. to the end of the file notes.
So can we use redirect in find -exec?
No, because the > {} is handled by Bash before invoking find. Technically, instead of running
find ... -exec echo 0x0 > {} ...
you could run
find ... -exec bash -c 'echo 0x0 > {}' ...
but I think it's simpler to write:
for dir in /sys/class/scsi_host/host* ; do
echo 0x0 > "$dir"/lpfc_log_verbose
done
(which — fear not — does handle spaces and newlines and control characters).
107
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
