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Bash: commands, attributes, ls, grep & pipe

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Max Yankov
2013-08-18 14:25:20 +02:00
parent a538c52fb4
commit 3e8c292a10
1 changed files with 12 additions and 1 deletions
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13
bash.html.markdown
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@@ -44,12 +44,23 @@ if true
then then
echo "This is expected" echo "This is expected"
else else
echo "And is was not" echo "And this is not"
fi fi
# Expressions are denoted with the following format: # Expressions are denoted with the following format:
echo $(( 10 + 5 )) echo $(( 10 + 5 ))
# Unlike other programming languages, bash is a shell — so it works in a context of current directory.
# You can list files and directories in the current directories with ls command:
ls
# These commands have options that control their execution:
ls -l # Lists every file and directory on a separate line
# Results of the previous command can be passed to the next command as input.
# grep command filters the input with provided patterns. That's how we can list txt files in the current directory:
ls -l | grep "\.txt"
# Commands can be substitued within other commands using $( ): # Commands can be substitued within other commands using $( ):
# The following command displays the number of files and directories in the current directory. # The following command displays the number of files and directories in the current directory.
echo "There are $(ls | wc -l) items here." echo "There are $(ls | wc -l) items here."