If you wanted to remove a certain NUMBER of path components, you should use cut with -d”https://stackoverflow.com/”. For example, if path=/home/dude/some/deepish/dir: To remove the first two components: # (Add 2 to the number of components to remove to get the value to pass to -f) echo $path | cut -d”https://stackoverflow.com/” -f4- # output: # some/deepish/dir … Read more
The bug #712 suggests that make does not handle names with spaces. Nowhere, never. I found a blog post saying it’s partially implemented by escaping the spaces with \ (\\ seems to be typo or formatting artefact), but: It does not work in any functions except $(wildcard). It does not work when expanding lists of … Read more
export in sh and related shells (such as Bash), marks an environment variable to be exported to child-processes, so that the child inherits them. export is defined in POSIX: The shell shall give the export attribute to the variables corresponding to the specified names, which shall cause them to be in the environment of subsequently … Read more
Instead of hardcoding password in a shell script, use SSH keys, its easier and secure. $ scp -i ~/.ssh/id_rsa *.derp devops@myserver.org:/path/to/target/directory/ assuming your private key is at ~/.ssh/id_rsa and the files you want to send can be filtered with *.derp To generate a public / private key pair : $ ssh-keygen -t rsa The above … Read more
Run your script with . . myscript.sh This will run the script in the current shell environment. export governs which variables will be available to new processes, so if you say FOO=1 export BAR=2 ./runScript.sh then $BAR will be available in the environment of runScript.sh, but $FOO will not.
Unix shells operate a series of transformations on each line of input before executing them. For most shells it looks something like this (taken from the Bash man page): initial word splitting brace expansion tilde expansion parameter, variable and arithmetic expansion command substitution secondary word splitting path expansion (aka globbing) quote removal Using $cmd directly … Read more
It’s the dollar sign, in makefiles you’ll have to type $$ to get a single dollar sign: M_ARCH := $(shell g++ -dumpmachine | awk ‘{split($$1,a,”-“);print a[1]}’)
Based on your example, it looks like you are trying to do something akin to always deleting a temporary file, regardless of how a script exits. In Bash to do this try the trap builtin command to trap the EXIT signal. #!/bin/bash trap ‘rm tmp’ EXIT if executeCommandWhichCanFail; then mv output else mv log exit … Read more
ls whateveryouwant | xargs -n 1 basename Does that work for you? Otherwise you can (cd /the/directory && ls) (yes, parentheses intended)
Put it in a variable first and then try to test it, as shown below ret=$? if [ $ret -ne 0 ]; then echo “In If” else echo “In Else” fi This should help. Edit: If the above is not working as expected then, there is a possibility that you are not using $? at … Read more