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adjusted hierarchy and fixed the sed anchor link
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Pat Beirne
2021-04-24 15:12:05 -04:00
committed by GitHub
parent 2ebc9e3d2e
commit 833e32f146
1 changed files with 13 additions and 13 deletions
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README.md
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@@ -99,7 +99,7 @@ cat -l244-$ log.txt # from 244 to the end
For `grep` and `sed`, the patterns are *MicroPython* regular explressions, from the `re` module. If a pattern has a space character in it, then the pattern **must** be wrapped in single-quote ' characters; patterns without an embedded space char can simply be typed. [The line parser is basically a `str.split()` unless a leading ' is detected.] To include a single quote in a quoted-pattern, you can escape it with ``\'` . For `grep` and `sed`, the patterns are *MicroPython* regular explressions, from the `re` module. If a pattern has a space character in it, then the pattern **must** be wrapped in single-quote ' characters; patterns without an embedded space char can simply be typed. [The line parser is basically a `str.split()` unless a leading ' is detected.] To include a single quote in a quoted-pattern, you can escape it with ``\'` .
The documentation for the `sed` command is [here](#sed()) The documentation for the `sed` command is [here](#sed)
Here are some valid uses of `sed` and `grep` Here are some valid uses of `sed` and `grep`
@@ -115,7 +115,7 @@ The **REPL** typing-history is functional, so you can use the up-arrow to recall
Commands with invalid syntax return a line of information, and are ignored. Non valid commands are simply eaten and ignored. Commands with invalid syntax return a line of information, and are ignored. Non valid commands are simply eaten and ignored.
## Limitations ### Limitations
In its present form, the module has these limitations: In its present form, the module has these limitations:
@@ -136,7 +136,7 @@ In its present form, the module has these limitations:
* this simple shell is different than [`mpfshell`](https://github.com/wendlers/mpfshell) in that *this* shell runs entirely on the target device. There is no allowance in this shell for transferring files in/out of the target. * this simple shell is different than [`mpfshell`](https://github.com/wendlers/mpfshell) in that *this* shell runs entirely on the target device. There is no allowance in this shell for transferring files in/out of the target.
* after a restart of your *MicroPython* board, you can invoke the shell with `import tf`; if you `^C` out of the shell, the second invocation of `tf` will have to be `import tf` followed by `tf.main()`, since the python interpreter caches the module and only loads it once per restart; you can intentionally restart the REPL prompt by hitting `^D` * after a restart of your *MicroPython* board, you can invoke the shell with `import tf`; if you `^C` out of the shell, the second invocation of `tf` will have to be `import tf` followed by `tf.main()`, since the python interpreter caches the module and only loads it once per restart; you can intentionally restart the REPL prompt by hitting `^D`
## Examples ### Examples
Make a simple change to a source file, perhaps modify a constant. Make a simple change to a source file, perhaps modify a constant.
@@ -216,7 +216,7 @@ If you don't need the *simple command line*, you can still use the methods liste
-----cut here -----cut here
``` ```
## Extensions ### Extensions
I found the simple command line so useful, I added some extra non-file-related functions. These are included in the optional file `tf_extend.py`. The available command list is extended to include I found the simple command line so useful, I added some extra non-file-related functions. These are included in the optional file `tf_extend.py`. The available command list is extended to include
@@ -266,7 +266,7 @@ except:
print("problem copying file") print("problem copying file")
``` ```
#### cp() ### cp()
``` ```
cp(src-filename, dest-filename) cp(src-filename, dest-filename)
@@ -280,7 +280,7 @@ Simply copies a source file to a destination file. Filenames may include folders
**NOTE** this function *only works on text files* delimited by `\n`. Line lengths of up to 4096 work fine on the ESP8266. **NOTE** this function *only works on text files* delimited by `\n`. Line lengths of up to 4096 work fine on the ESP8266.
#### cat() ### cat()
``` ```
cat(filename, first=1, last=1000000, numbers=False, title=True) cat(filename, first=1, last=1000000, numbers=False, title=True)
@@ -295,7 +295,7 @@ Simply copies a source file to a destination file. Filenames may include folders
Displays the source file on the screen. You can specify a line range, and whether line numbers are displayed, and whether to put a *title line* on the output display. Displays the source file on the screen. You can specify a line range, and whether line numbers are displayed, and whether to put a *title line* on the output display.
#### _dir() ### _dir()
``` ```
dir(directory-name='.') dir(directory-name='.')
@@ -310,7 +310,7 @@ File dates are not displayed, as they all depend on the time from last reboot, a
NOTE: the name is `_dir()` because `dir()` is a python builtin. NOTE: the name is `_dir()` because `dir()` is a python builtin.
#### grep() ### grep()
``` ```
grep(filename, pattern, numbers=False) grep(filename, pattern, numbers=False)
@@ -326,7 +326,7 @@ NOTE: the name is `_dir()` because `dir()` is a python builtin.
You can search a file for a pattern, and any matching lines are displayed. Searches are restricted to within a line, don't bother with `\r` and `\n` searches. You can search a file for a pattern, and any matching lines are displayed. Searches are restricted to within a line, don't bother with `\r` and `\n` searches.
###### Examples #### Examples
``` ```
tf.grep('log.txt', '2021-03-\d\d') tf.grep('log.txt', '2021-03-\d\d')
@@ -334,7 +334,7 @@ tf.grep('config.txt', '^user\s*=')
tf.grep('config.ini', '\[\w*\]', numbers = True) tf.grep('config.ini', '\[\w*\]', numbers = True)
``` ```
#### sed() ### sed()
``` ```
sed(filename, pattern, bak_ext=".bak") sed(filename, pattern, bak_ext=".bak")
@@ -360,7 +360,7 @@ This version of `sed` has 6 commands:
If the single-letter command is preceded by a number or number-range, then the edit operation only applies to that line(s). A number range may be separated by `-` hyphen or `,` comma. Use `$` to indicate end-of-file. If the single-letter command is preceded by a number or number-range, then the edit operation only applies to that line(s). A number range may be separated by `-` hyphen or `,` comma. Use `$` to indicate end-of-file.
##### Examples #### Examples
``` ```
12aMAX_FILE_NAME=255 insert a line AFTER line 12 12aMAX_FILE_NAME=255 insert a line AFTER line 12
@@ -396,7 +396,7 @@ s@ratio\s*=\s*num/denom@ratio = num/denom if denom else 0@
**Note**: `sed()` errors may leave the subject-file empty, but it almost always make the backup file before failing. **Note**: `sed()` errors may leave the subject-file empty, but it almost always make the backup file before failing.
#### General Notes ### General Notes
**Note**: On error, all the functions above throw exceptions. The simple command line shell above catches the exceptions. If you use the functions, wrap them up in `try/except`. **Note**: On error, all the functions above throw exceptions. The simple command line shell above catches the exceptions. If you use the functions, wrap them up in `try/except`.