LPIC-1 Exam 102 Topic 105: Shells and Shell Scripting
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Questions and Answers

What is the main strength of aliases and functions in shell scripting?

  • They enable the creation of complex shell scripts
  • They allow for parallel processing of commands
  • They provide a way to secure shell scripts
  • They offer the possibility of putting together a series of repetitive or recurrent commands (correct)

    • What is the syntax for declaring an alias in shell scripting?

  • The command(s) followed by the alias name
  • The keyword alias followed by the alias assignment (correct)
  • The alias name followed by the alias definition
  • The alias assignment followed by the keyword alias

    • What is the purpose of an alias in shell scripting?

  • To delete a command
  • To modify an existing command
  • To provide a substitute name for another command(s) (correct)
  • To create a new command

    • What is the relationship between variables, aliases, and functions in shell scripting?

    <p>They influence each other</p> Signup and view all the answers

    What is the benefit of using aliases and functions in shell scripting?

    <p>They offer flexibility and time-saving</p> Signup and view all the answers

    Study Notes

    Customize and Use the Shell Environment

    • Set environment variables at login or when spawning a new shell, e.g., PATH.
    • Write Bash functions for frequently used sequences of commands.
    • Maintain skeleton directories for new user accounts.
    • Set command search path with the proper directory.

    Environment Variables

    • /etc/bash.bashrc and /etc/profile are used to set environment variables.
    • env, export, set, and unset are used to manipulate environment variables.
    • ~/.bash_profile, ~/.bash_login, ~/.profile, ~/.bashrc, and ~/.bash_logout are used to set environment variables for individual users.

    Bash Commands

    • source command is used to load a file into the current shell.
    • function command is used to define a function.
    • alias command is used to define an alias.

    Setting Language and Working Directory

    • export LANG=es_ES.UTF-8 sets the language of the current shell to Spanish UTF-8.
    • pwd command prints the name of the current working directory.

    Setting and Using Variables

    • export PATH=$PATH:/home/carol/scripts sets the PATH environment variable to include a new directory.
    • my_path=$PATH sets the value of my_path to the value of PATH.
    • mammal=gnu sets a local variable mammal to the value gnu.
    • var_sub="The value of mammal is $mammal" sets a local variable var_sub using variable substitution.

    Creating and Searching Environment Variables

    • export mammal=gnu turns a local variable into an environment variable.
    • set | grep mammal and env | grep mammal are used to search for an environment variable.

    Creating and Managing Directories

    • mkdir ~/bin creates a new directory named bin in the home directory.
    • export PATH=$PATH:~/bin adds the ~/bin directory to the PATH environment variable.

    Adding to ~/.profile

    • if [ -d ~/bin ]; then export PATH=$PATH:~/bin; fi is used to add the ~/bin directory to the PATH environment variable in the ~/.profile file.

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    LPI-Learning-Material-102-500-en-1.pdf

    Description

    Customize and use the shell environment. Set environment variables, write Bash functions, and maintain skeleton directories for new user accounts.

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