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Caleb Boylan
book
Commits
044d0f29
Commit
044d0f29
authored
Apr 08, 2017
by
Jeremy Soller
Committed by
GitHub
Apr 08, 2017
Browse files
Merge pull request #92 from schutzekatze/patch-2
Fix typing errors in Ion syntax
parents
29de0dc4
afb2d918
Changes
1
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src/userspace/ion/the_syntax.md
View file @
044d0f29
...
...
@@ -61,14 +61,14 @@ echo "The maximum amount of commands to retain in the log: $HISTORY_FILE_SIZE"
echo "Path of the log file: $HISTORY_FILE"
# Now that we know how to echo and use variables,
# let's learn some of the other basics of
bash
!
# let's learn some of the other basics of
Ion
!
# Our current directory is available through the command `pwd`.
# `pwd` stands for "print working directory".
# We can also use the builtin variable `$PWD`.
# Observe that the following are equivalent:
echo "I'm in $PWD" # interpolates the variable
echo "I'm in $
{PWD}
" # execs `pwd` and interpolates output
echo "I'm in $
(pwd)
" # execs `pwd` and interpolates output
# If you get too much output in your terminal, or from a script, the command
# `clear` clears your screen
...
...
@@ -92,7 +92,7 @@ end
if "" != $USER # ...
# which works as expected
# Unlike other programming languages,
bash
is a shell so it works in the context
# Unlike other programming languages,
Ion
is a shell so it works in the context
# of a current directory. You can list files and directories in the current
# directory with the ls command:
ls
...
...
@@ -120,18 +120,18 @@ cp -r srcDirectory/ dst/ # recursively copy
# `mv` is also useful for renaming files!
mv s0urc3.txt dst.txt # sorry, l33t hackers...
# Since
bash
works in the context of a current directory, you might want to
# Since
Ion
works in the context of a current directory, you might want to
# run your command in some other directory. We have cd for changing location:
cd ~ # change to home directory, also available as `$HOME`
cd .. # go up one directory
# (^^say, from /home/username/Downloads to /home/username)
cd /home/username/Documents # change to specified directory
cd ~/Documents/.. # still in home directory..isn't it??
cd ~/Documents/.. # still in home directory..
.
isn't it??
# Use `mkdir` to create new directories.
mkdir myNewDir
# You can redirect output of
one
command to a
nother command
# You can redirect output of
a
command to a
file
echo "Hello" > hello.txt # will overwrite file if already exists
echo "Another line" >> hello.txt # will append to an existing file,
# this command will fail if the file does not exist yet
...
...
@@ -168,7 +168,7 @@ ask_name_and_say_hello
test hello world goodbye
# not passing the correct amount of parameters will result in an error ($?=127)
# Read Ion shell builtins documentation with the
i
on 'help' builtin command:
# Read Ion shell builtins documentation with the
I
on 'help' builtin command:
help # displays available builtin commands
help cd # displays help information available for builtin cd command
```
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