Question

6

How can I delete specific string from a file

rated 0 times [ 6] [ 0] / answers: 1 / hits: 4349 / 2 Years ago, sat, june 18, 2022, 12:54:47

I do have a bash script. I want to delete a specific string from a text file. I already found a command on the online but it seems it isn't that stable..

I've tried;

mv .admins .adminsold

sed -r "s#${MYFUNCTION}(,|$)##g" <.adminsold >.admins

My input file;

# Admin rule

[[rule]]

    # Set your admin Group Ids here, ex: [ 13, 42 ]

        groupid = [  329, 2, 324, 156 ]

    # And/Or your admin Client Uids here

    useruid = []

    # By default treat requests from localhost as admin

    ip = [ "127.0.0.1", "::1" ]

    "+" = "*"

Expected file;

# Admin rule

[[rule]]

    # Set your admin Group Ids here, ex: [ 13, 42 ]

        groupid = [  329, 2, 156 ]

    # And/Or your admin Client Uids here

    useruid = []

    # By default treat requests from localhost as admin

    ip = [ "127.0.0.1", "::1" ]

    "+" = "*"

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homerurhyth

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answered 2 Years ago allally · Accepted Answer

If all you need is to remove 324,(i.e. exactly: one whitespace then 324 then one comma ,) from the file, then use:

sed 's/ 324,//' file

And to edit the file itself(i.e. overwrite the original file), use:

sed -i 's/ 324,//' file

Please see this answer for more info.

Things to consider from your example:

? will make the previous character optional and you nead to escape it with a backslash ... e.g. to make the , optional use:
```
sed 's/ 324,?//' file
```

If you need to match a literal /, you need to either escape it / or you can change the delimeter from the usual / to something else like @(or : or anything else) like so:
```
sed 's@wxyz0123456789+/@@' file
```

If you want to apply the substitution only on lines that include groupid then specify /groupid/ as a condition before the substitution part like so:
```
sed '/groupid/ s/ 324,//' file
```