Linux shell script: Run a program only if it exists, ignore it if it does not exist
2320
Why not use "which"? What to use then?
41491
Make sure only a single instance of a program is running
79635
Test if file exists
111176
Do not start loop if there is no files in directory?
144952
How to make sure only one instance of a bash script runs?
39522
Linux: copy and create destination dir if it does not exist
148538
How do I run a program with a different working directory from current, from Linux shell?
58488
Aborting a shell script if any command returns a non-zero value
7117
How to automatically restart a linux background process if it fails?
73227
How to block running two instances of the same program?
136299
How to run programs from a linux terminal without blocking the terminal?
8269
bash if not multiple conditions without subshell?
19329
How to check if directory exists in %PATH%?
59353
How to tell if a command executed by `exec` runs successfully or not?
16417
Run a command without making me wait
1949
How do I check whether a file exists without exceptions?
158565
Determine if a function exists in bash