Uppercasing First Letter of Words Using SED
This line should do it: sed -e “s/\b\(.\)/\u\1/g”
linux
Removing Windows newlines on Linux (sed vs. awk)
You can use the command line tool dos2unix dos2unix input Or use the tr command: tr -d ‘\r’ <input >output Actually, you can do the file-format switching in vim: Method A: :e ++ff=dos :w ++ff=unix :e! Method B: :e ++ff=dos :set ff=unix :w EDIT If you want to delete the \r\n sequences in the file, … Read more
Linux Script to check if process is running and act on the result
Programs to monitor if a process on a system is running. Script is stored in crontab and runs once every minute. This works with if process is not running or process is running multiple times: #! /bin/bash case “$(pidof amadeus.x86 | wc -w)” in 0) echo “Restarting Amadeus: $(date)” >> /var/log/amadeus.txt /etc/amadeus/amadeus.x86 & ;; 1) … Read more
How to handle OpenSSL SSL_ERROR_WANT_READ / WANT_WRITE on non-blocking sockets
With non-blocking sockets, SSL_WANT_READ means “wait for the socket to be readable, then call this function again.”; conversely, SSL_WANT_WRITE means “wait for the socket to be writeable, then call this function again.”. You can get either SSL_WANT_WRITE or SSL_WANT_READ from both an SSL_read() or SSL_write() call.
How to limit user commands in Linux [closed]
There are lots of different ways that you could achieve this. I’m going to list one of several possible solutions. I would propose using several different layers of protection to prevent users from running the commands that they shouldn’t be allowed to access. All of the directions here assume that users have their own /home/[username] … Read more
How to prevent writer starvation in a read write lock in pthreads
This does indeed depend on the implementation – so since you have asked about Linux specifically, my comments are refer to the current NPTL implementation of pthreads, which is used in modern glibc. There are two related, but separate, issues here. Firstly, there is this situation: There are read locks currently held, and writers waiting. … Read more
How to run a process with a timeout in Bash? [duplicate]
Use the timeout command: timeout 15s command Note: on some systems you need to install coreutils, on others it’s missing or has different command line arguments. See an alternate solution posted by @ArjunShankar . Based on it you can encapsulate that boiler-plate code and create your own portable timeout script or small C app that … Read more
What does the “no version information available” error from linux dynamic linker mean?
The “no version information available” means that the library version number is lower on the shared object. For example, if your major.minor.patch number is 7.15.5 on the machine where you build the binary, and the major.minor.patch number is 7.12.1 on the installation machine, ld will print the warning. You can fix this by compiling with … Read more
Is there a programmatic way to inspect the current rpath on Linux?
For the record, here are a couple of commands that will show the rpath header. objdump -x binary-or-library |grep RPATH Maybe an even better way to do it is the following: readelf -d binary-or-library |head -20 The second command also lists the direct dependencies on other libraries followed by rpath.