大约有 36,000 项符合查询结果（耗时：0.0330秒） [XML]
Shell one liner to prepend to a file
... Works for me on 600K files with awk. However trying the same trick using 'cat' fails.
Passing the prependage as a variable to awk (-v TEXT="$text") overcomes the literal quotes problem which prevents doing this trick with 'sed'.
#!/bin/bash
text="Hello world
What's up?"
exec 3<> yourfile &...
How to pretty print XML from the command line?
...
Note that the "cat data.xml | xmllint --format - | tee data.xml" does not work. On my system it sometimes worked for small files, but always truncated huge files. If you really want to do anything in place read backreference.org/2011/01/29/...
How to get the first line of a file in a bash script?
...
@sorin, cat ... | read VAR will fail in most shells (all except zsh as far as I know) because each of the components in a pipe will run in separate subshells. Meaning that $VAR will be set in subshell (that cease to exist as soon as ...
Hidden features of C
...
A big negative is that GCC does not have a flag to catch signed integer overflows and throw a runtime exception. While there are x86 flags for detecting such cases, GCC does not utilize them. Having such a flag would allow non-performance-critical (especially legacy) applic...
How to find out what group a given user has?
... format.
sh collection.sh
#!/bin/bash
HOSTNAME=`hostname -s`
for i in `cat /etc/passwd| grep -vE "nologin|shutd|hal|sync|root|false"|awk -F':' '{print$1}' | sed 's/[[:space:]]/,/g'`; do groups $i; done|sed s/\:/\,/g|tr -d ' '|sed -e "s/^/$HOSTNAME,/"> /tmp/"$HOSTNAME"_inventory.txt
sudo cat ...
setting an environment variable in virtualenv
...s in $VIRTUAL_ENV/bin/. You need the postactivate hook.
$ workon myvenv
$ cat $VIRTUAL_ENV/bin/postactivate
#!/bin/bash
# This hook is run after this virtualenv is activated.
export DJANGO_DEBUG=True
export S3_KEY=mykey
export S3_SECRET=mysecret
$ echo $DJANGO_DEBUG
True
If you want to keep this ...
How to get .pem file from .key and .crt files?
How can I create a PEM file from an SSL certificate?
10 Answers
10
...
PostgreSQL: How to make “case-insensitive” query
... It's important to note that using LOWER (or any function) on the predicate columns--in this case "name"--will cause any indexes to no longer be seekable. If this is a large or frequently queried table, that could cause trouble. Case-insensitive collation, citext, or a function-based index will ...
Mac OS X Terminal: Map option+delete to “backward delete word”
...cOS High Sierra 10.13.6, captured on October 23, 2018.
Notes
Many applications (including bash and tcsh) treat Meta-Delete as "backward delete word."
share
|
improve this answer
|
...
Label encoding across multiple columns in scikit-learn
... return self.fit(X,y).transform(X)
Suppose we want to encode our two categorical attributes (fruit and color), while leaving the numeric attribute weight alone. We could do this as follows:
MultiColumnLabelEncoder(columns = ['fruit','color']).fit_transform(fruit_data)
Which transforms our ...