Commands using ls (517)

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Find usb device
I often use it to find recently added ou removed device, or using find in /dev, or anything similar. Just run the command, plug the device, and wait to see him and only him

determine if tcp port is open
@putnamhill, no need if statement in that case. && is a AND and || is a OR

create SQL-statements from textfile with awk
inputfile.txt is a space-separated textfile, 1st column contains the items (id) I want to put into my SQL statement. 39 = charactercode for single tick ' $1 = first column If inputfile.txt is a CSV-file separated by "," use FS= to define your own field-separator: $ awk 'BEGIN {FS=","; }{printf "select * from table where id = %c%s%c;\n",39,$1,39; }' inputfile.txt

Convert CSV to JSON
Replace 'csv_file.csv' with your filename.

List files with full path
Using just globing

Print line immediately before a matching regex.
Use this if you don't have access to GNU grep's -B option.

Multi-segment file downloading with lftp
This is for files only, for directories 'mirror' has to be used.

sed edit-in-place using -a option instead of -i option (no tmp file created)
does the -i option open a tmp file? this method does not.

Downsample mp3s to 128K
This will lower the quality of mp3 files, but is necessary to play them on some mobile devices.

Create a mirror of a local folder, on a remote server
Create a exact mirror of the local folder "/root/files", on remote server 'remote_server' using SSH command (listening on port 22) (all files & folders on destination server/folder will be deleted)


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