From wikipedia Bash When Bash starts, it executes the commands in a variety of different scripts. When Bash is invoked as an interactive login shell, it first reads and executes commands from the file /etc/profile, if that file exists. After reading that file, it looks for ~/.bash_profile, ~/.bash_login, and ~/.profile, in that order, and reads … Read more
To avoid changing your git config, you can enable colour just for the current command by passing a config variable with -c. For the status command, the variable is color.status: git -c color.status=always status | less -REX For diff, show, log and grep commands, the variable is color.ui: git -c color.ui=always diff | less -REX … Read more
The mktemp(1) man page explains it fairly well: Traditionally, many shell scripts take the name of the program with the pid as a suffix and use that as a temporary file name. This kind of naming scheme is predictable and the race condition it creates is easy for an attacker to win. A safer, though … Read more
Brace expansion, {x..y} is performed before other expansions, so you cannot use that for variable length sequences. Instead, use the seq 2 $max method as user mob stated. So, for your example it would be: max=10 for i in `seq 2 $max` do echo “$i” done
Use find: find . -maxdepth 1 -name “*string*” -print It will find all files in the current directory (delete maxdepth 1 if you want it recursive) containing “string” and will print it on the screen. If you want to avoid file containing ‘:’, you can type: find . -maxdepth 1 -name “*string*” ! -name “*:*” … Read more
Try this Bash syntax instead of trying to use an external program expr: count=$((FIRSTV-SECONDV)) BTW, the correct syntax of using expr is: count=$(expr $FIRSTV – $SECONDV) But keep in mind using expr is going to be slower than the internal Bash syntax I provided above.
In Bash, you should get what you need like this: #!/usr/bin/env bash BASEDIR=$(dirname “$0”) echo “$BASEDIR”
Will your python script desire to open the file for writing or for reading? Is the legacy application opening and closing the file between writes, or does it keep it open? It is extremely important that we understand what the legacy application is doing, and what your python script is attempting to achieve. This area … Read more
You can do it with eval. It may be ugly, but so is having to make a shell script for this. Plus, it’s all on one line. For example find -type f -exec bash -c “eval md5sum {} > {}.sum ” \;
Take a look at the enlightening presentation File Locking Tricks and Traps: This short talk presents several common pitfalls of file locking and a few useful tricks for using file locking more effectively. Edit: To address your questions more precisely: Is there a better synchronization method than the lock file? As @Hasturkun already mentioned and … Read more