Contents
How do I display directory stack content?
The contents of the directory stack can be seen using the dirs command. Directories are added to the stack when changing to a directory using the pushd command and removed with the popd command. The current working directory is always on the top of the directory stack.
How do you debug shell script?
The debugging options available in the Bash shell can be switched on and off in multiple ways. Within scripts, we can either use the set command or add an option to the shebang line. However, another approach is to explicitly specify the debugging options in the command-line while executing the script.
What is the syntax to print all the indexes of an array?
We can use the keyword ‘declare’ with a ‘-p’ option to print all the elements of a Bash Array with all the indexes and details. The syntax to print the Bash Array can be defined as: declare -p ARRAY_NAME.
What is pushd command?
pushd is a shell built-in command which allows us to easily manipulate the directory stack. This appends a directory to the top of the directory stack, or rotates the stack, making the new top of the stack the present working directory. This stack is based on the Last In First Out (LIFO) principle.
Which option is used for debugging the script?
Debug Statement Options
| Option | Meaning |
|---|---|
| set -x | Prints the statements after interpreting metacharacters and variables |
| set +x | Stops the printing of statements |
| set -v | Prints the statements before interpreting metacharacters and variables |
| set -f | Disables file name generation (using metacharacters) |
What is a good array?
Let’s call an array good if there is an element in the array that equals to the sum of all other elements. For example, the array a=[1,3,3,7] is good because there is the element a4=7 which equals to the sum 1+3+3. You are given an array a consisting of n integers.
How does The DIRS command in Linux work?
dirs command shell builtin is used to display the list of currently remembered directories. By default, it includes the directory you are currently in. A directory can get into the list via pushd command followed by the dir name and can be removed via popd command.
Which is the command to remove a Dir?
By default, it includes the directory you are currently in. A directory can get into the list via pushd command followed by the dir name and can be removed via popd command. It is useful for easy and quick flow through the directories on the command line.
How to list only files that exist in Dir1?
To list ONLY the files that exist in dir1 you can use: This answer optimizes one of the suggestions from @Adail-Junior by adding the -D option, which is helpful when neither of the directories being compared are git repositories: If you use -D then you won’t see comparisons to /dev/null : text Binary files a/whatever and /dev/null differ
How to iterate over dirs in a bash script?
More than 20 years ago, at the release of bash 2.0, I redefined the cd function and I have used my own version of cd ever since on various solaris, bsd and linux systems. Typing cd without any arguments would list the top 7 directories of DIRSTACK and typing cd with a number argument would change directory using the DIRSTACK.