There are multiple ways to do this and from your question it’s nor clear what you need. 1. If you need environment variable to be defined PER TASK ONLY, you do this: – hosts: dev tasks: – name: Echo my_env_var shell: “echo $MY_ENV_VARIABLE” environment: MY_ENV_VARIABLE: whatever_value – name: Echo my_env_var again shell: “echo $MY_ENV_VARIABLE” Note … Read more
I had the exact same error, and like you, installing zlib1g-dev did not fix it. Installing lib32z1-dev got me past it. I have a 64 bit system and it seems like it wanted the 32 bit library.
I think this is very annoying, and I think it is arrogant to call a feature “useless” because it has problems dealing with certain use cases. The biggest problem with the glibc approach is that it hard-codes paths to system libraries (gconv as well as nss), and thus it breaks when people try to run … Read more
When selecting your IPC you should consider causes for performance differences including transfer buffer sizes, data transfer mechanisms, memory allocation schemes, locking mechanism implementations, and even code complexity. Of the available IPC mechanisms, the choice for performance often comes down to Unix domain sockets or named pipes (FIFOs). I read a paper on Performance Analysis … Read more
I have used Systrace to sandbox untrusted programs both interactively and in automatic mode. It has a ptrace()-based backend which allows its use on a Linux system without special privileges, as well as a far faster and more poweful backend which requires patching the kernel. It is also possible to create a sandbox on Unix-like … Read more
All answers so far use find, so here’s one with just the shell. No need for external tools in your case: for dir in /tmp/*/ # list directories in the form “/tmp/dirname/” do dir=${dir%*/} # remove the trailing “/” echo “${dir##*/}” # print everything after the final “/” done
The syntax is token-level, so the meaning of the dollar sign depends on the token it’s in. The expression $(command) is a modern synonym for `command` which stands for command substitution; it means run command and put its output here. So echo “Today is $(date). A fine day.” will run the date command and include … Read more
sed can operate on an address: $ sed -i ‘1s/^/<added text> /’ file What is this magical 1s you see on every answer here? Line addressing!. Want to add <added text> on the first 10 lines? $ sed -i ‘1,10s/^/<added text> /’ file Or you can use Command Grouping: $ { echo -n ‘<added text> … Read more
What you need is nm and its -D option: $ nm -D /usr/lib/libopenal.so.1 . . . 00012ea0 T alcSetThreadContext 000140f0 T alcSuspendContext U atanf U calloc . . . Exported sumbols are indicated by a T. Required symbols that must be loaded from other shared objects have a U. Note that the symbol table does … Read more
ls -Art | tail -n 1 Not very elegant, but it works. Used flags: -A list all files except . and .. -r reverse order while sorting -t sort by time, newest first