|
Size: 448
Comment: How do I prepend a text to a file (the opposite of >>)?
|
Size: 681
Comment:
|
| Deletions are marked like this. | Additions are marked like this. |
| Line 1: | Line 1: |
| [[Anchor(faq90)]] | <<Anchor(faq90)>> |
| Line 3: | Line 3: |
| You cannot do it with bash redirections alone; the opposite of `>>` does not exist.... | |
| Line 4: | Line 5: |
| You cannot do it with bash redirections only, ie the opposite of >> does not exist. | To do it in 2 commands with sed: sed "1iTEXTTOPREPEND" filename > tmp mv tmp filename |
| Line 6: | Line 9: |
| You can use an editor: | To insert content at the beginning of a file, you can use an editor: |
| Line 8: | Line 11: |
| ed -s file << EOF i |
ex file << EOF 0a |
| Line 16: | Line 19: |
| you can use things like: | ex will also add a newline character to the end of the file if it's missing. Or you can rewrite the file, using things like: |
| Line 22: | Line 27: |
| or a gazillion of other solutions | or lots of other solutions. |
How do I prepend a text to a file (the opposite of >>)?
You cannot do it with bash redirections alone; the opposite of >> does not exist....
To do it in 2 commands with sed: sed "1iTEXTTOPREPEND" filename > tmp mv tmp filename
To insert content at the beginning of a file, you can use an editor:
ex file << EOF 0a header line 1 header line 2 . w EOF
ex will also add a newline character to the end of the file if it's missing.
Or you can rewrite the file, using things like:
{ echo line; cat file ;} >tmpfile && mv tmpfile file
echo line | cat - file > tmpfile && mv tmpfile fileor lots of other solutions.