大约有 2,100 项符合查询结果（耗时：0.0174秒） [XML]
psql - save results of command to a file
...om psql's help (\?):
\o [FILE] send all query results to file or |pipe
The sequence of commands will look like this:
[wist@scifres ~]$ psql db
Welcome to psql 8.3.6, the PostgreSQL interactive terminal
db=>\o out.txt
db=>\dt
db=>\q
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How do I limit the number of results returned from grep?
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Note that you cannot use the | head pipe when using grep with -A or -B (and thus not only searching for result (-o), but for context as well). In that case you're left with -m to tell grep the number of lines with results to be returned.
–...
How to do something to each file in a directory with a batch script
...ge the delimiter the for /f command is using. for example, you can use the pipe char.
for /f "delims=|" %%f in ('dir /b c:\') do echo %%f
Update 2: (quick one year and a half after the original answer :-)) If the directory name itself has a space in the name, you can use the usebackq option on th...
How to kill all processes matching a name?
... construct argument list(s) and execute utility. Helpful when you want to pipe in arguments to something like kill or ls or so on.
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How to concatenate multiple lines of output to one line?
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@oink you could pipe the results into sed '$s/..$//' to delete the last 2 characters on the last line.
– Chris Seymour
Jan 19 '17 at 23:27
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Which commit has this blob?
...e, '-|', git => 'ls-tree' => $tree
or die "Couldn't open pipe to git-ls-tree: $!\n";
while ( <$ls_tree> ) {
/\A[0-7]{6} (\S+) (\S+)/
or die "unexpected git-ls-tree output";
return 1 if $2 eq $obj_name;
push @subtree...
Make: how to continue after a command fails?
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Return successfully by blocking rm's returncode behind a pipe with the true command, which always returns 0 (success)
rm file | true
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Remove DEFINER clause from MySQL Dumps
...rences of DEFINER=root@localhost with an empty string ""
Edit the dump (or pipe the output) using perl:
perl -p -i.bak -e "s/DEFINER=\`\w.*\`@\`\d[0-3].*[0-3]\`//g" mydatabase.sql
Pipe the output through sed:
mysqldump ... | sed -e 's/DEFINER[ ]*=[ ]*[^*]*\*/\*/' > triggers_backup.sql
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How to retrieve the first word of the output of a command in bash?
I have a command, for example: echo "word1 word2" . I want to put a pipe ( | ) and get word1 from the command.
12 Answers
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Python vs Bash - In which kind of tasks each one outruns the other performance-wise? [closed]
... commands in a simple way. Also Bash (not sh) have some improvements, like pipefail, so chaining is really short and expressive.
+ do not require 3rd-party programs to be installed. can be executed right away.
- god, it's full of gotchas. IFS, CDPATH.. thousands of them.
If one writing a script big...