大约有 36,000 项符合查询结果（耗时：0.0194秒） [XML]
How to ignore xargs commands if stdin input is empty?
...t, put that e.g. in $HOME/bin and add it to the PATH:
#!/bin/bash
stdin=$(cat <&0)
if [[ $1 == "-r" ]] || [[ $1 == "--no-run-if-empty" ]]
then
# shift the arguments to get rid of the "-r" that is not valid on OSX
shift
# wc -l return some whitespaces, let's get rid of them with t...
How do I include a pipe | in my linux find -exec command?
...to perform the piping like so:
find -name 'file_*' -follow -type f -exec zcat {} \; | agrep -dEOE 'grep'
In terms of efficiency this results costs one invocation of find, numerous invocations of zcat, and one invocation of agrep.
This would result in only a single agrep process being spawned whi...
Bash function to find newest file matching pattern
...n does not say that the filenames are version numbers. This is about modification times. Even with the filename assumption b2.10_5_2 kills this solution.
– Eponymous
Dec 1 '16 at 22:38
...
Find size of Git repository
...list of all files in the repo history:
git rev-list --objects --all | git cat-file --batch-check="%(objectsize) %(rest)" | cut -d" " -f1 | paste -s -d + - | bc
You can replace --all with a treeish (HEAD, origin/master, etc.) to calculate the size of a branch.
...
How do I update an NPM module that I published?
...pmjs.com/getting-started/semantic-versioning
– Ilker Cat
Jul 21 '17 at 11:50
...
How can I remove specific rules from iptables?
...oblems looks this way:
1. Add temporary rule with some comment:
comment=$(cat /proc/sys/kernel/random/uuid | sed 's/\-//g')
iptables -A ..... -m comment --comment "${comment}" -j REQUIRED_ACTION
2. When the rule added and you wish to remove it (or everything with this comment), do:
iptables-save...
PG undefinedtable error relation users does not exist
...d to be passed. Otherwise, you shall to prepare the database (this is deprecated in Rails 4):
rake db:test:prepare
and then (if it is actually required):
RAILS_ENV=test rake db:seed
On newer versions of Rails the error ActiveRecord::NoEnvironmentInSchemaError may be risen, so just prepend the ...
How to keep environment variables when using sudo
...
Here is the quote from the man page:
-E, --preserve-env
Indicates to the security policy that the user wishes to preserve their
existing environment variables. The security policy may return an error
if the user does not have permission to preserve the envir...
Pandas conditional creation of a series/dataframe column
...
Here's yet another way to skin this cat, using a dictionary to map new values onto the keys in the list:
def map_values(row, values_dict):
return values_dict[row]
values_dict = {'A': 1, 'B': 2, 'C': 3, 'D': 4}
df = pd.DataFrame({'INDICATOR': ['A', 'B', '...
Can't connect Nexus 4 to adb: unauthorized
...in ~/.android/) from my computer to my device via email;
Invoke stop adbd;
cat adbkey.pub >> /data/misc/adb/adb_keys (authorize myself);
start adbd (restart adb with new keys).
share
|
improv...