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bash internal / flow control / others (4)

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1

bash

This demonstrates conditional execution in Bash, where commands are executed based on the success or failure of preceding commands.


git commit && git push
git commit || echo "Commit failed"

bash internal flow control others conditional execution

2

bash

This demonstrates conditional execution in Bash using || and && operators to chain commands based on the success or failure of previous commands.


echo "Always executed" || echo "Only executed if first command fails"
# => Always executed
echo "Always executed" && echo "Only executed if first command does NOT fail"
# => Always executed
# => Only executed if first command does NOT fail

bash internal flow control others conditional execution

3

bash

This demonstrates command chaining using && and || operators to create a directory and handle errors.


mkdir dir && cd dir || echo "Failed to create directory"

bash internal flow control others conditional execution (command chaining)

4

bash

This demonstrates using the ! operator to negate the result of a grep command and checking the exit status with $?.


! grep value file.txt; echo "$?"

bash internal flow control others command negation