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Guide for using the ex() tool to view and edit files. Use when the user asks about ex commands, ex syntax, or needs help with file editing via ex.
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| name | ex |
| description | Guide for using the ex() tool to view and edit files. Use when the user asks about ex commands, ex syntax, or needs help with file editing via ex. |
ex(path, cmds='', sw=4, linenums=False, as_dict=False)
Runs ex on a file. x is always appended — don't add wq/x. Multiline cmds work (heredoc). Use a on a non-existent path to create files.
linenums=True — appends %#; use with edit commands to see the resultsw — shiftwidth for >/< (default 4)as_dict — returns {'success': ...} or {'error': ...}ex('f.py', linenums=True) # view with line numbers
ex('f.py', cmds='10,20p') # view a range
ex('f.py', cmds='10,20#') # view a range with line numbers
ex('f.py', cmds='5s/old/new/\n4,6#') # substitute on line 5, then check
ex('f.py', cmds='%s/old/new/g', linenums=True) # whole-file substitute; see result immediately
ex('f.py', cmds='10,50g/DEBUG/d') # delete matching lines in a range
ex('f.py', cmds='5,10>\n4,11#') # indent, then check surrounding lines
ex('f.py', cmds='5,10<\n4,11#', sw=2) # dedent, then check surrounding lines
ex('f.py', cmds='1,3co10\n10,14#') # copy lines 1-3 after line 10, then check
ex('f.py', cmds='5,7m20\n19,23#') # move lines 5-7 after line 20, then check
ex('f.py', cmds='''5a
x = 1
.
4,7#''')
ex('new.py', cmds='''a
def hello():
print("hi")
.''', linenums=True)
s// — use \r to insert, \n to match. Use \\n to insert a literal \n.s delimiters — #, @, +, ; all work (e.g. s#/old/path#/new/path#). | does not (it's the ex command separator).\[ and \] in the match side. Unescaped in the replacement.a/i with . — forgetting the . terminator is silent and destructive: ex swallows all remaining commands (including x) as input text. Nothing gets saved, no error reported.linenums=True dumps the whole file — on large files, skip it and check a range with N,M# instead.a appends after the line — if the target line ends with a closing delimiter (e.g. """), the new text lands outside it. Use s to edit such lines in place.grep -n / rg -n line numbers match ex addressing, so you can find-then-fix:
bash("rg -n 'pattern' file.py") # find line numbers
ex('file.py', cmds='14s/old/new/\n13,15#') # edit by line number, then check