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How can I reverse the order of lines in a file?
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Also worth mentioning: tac (the, ahem, reverse of cat). Part of coreutils.
Flipping one file into another
tac a.txt > b.txt
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sed or awk: delete n lines following a pattern
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This might work for you:
cat <<! >pattern_number.txt
> 5 3
> 10 1
> 15 5
> !
sed 's|\(\S*\) \(\S*\)|/\1/,+\2{//!d}|' pattern_number.txt |
sed -f - <(seq 21)
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Unfortunately MyApp has stopped. How can I solve this?
I am developing an application, and everytime I run it, I get the message:
20 Answers
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How to echo shell commands as they are executed
...in/sh.
See the bash-hackers' wiki on set attributes, and on debugging.
$ cat shl
#!/bin/bash
DIR=/tmp/so
ls $DIR
$ bash -x shl
+ DIR=/tmp/so
+ ls /tmp/so
$
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Python Pandas: Get index of rows which column matches certain value
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Your suggestion indices = np.flatnonzero(df[col_name] == category_name) gets me exactly what the title of the question asks for, which is surprisingly difficult to find on the Internet.
– ClimbsRocks
Apr 14 '17 at 18:14
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What is the difference between $(command) and `command` in shell programming?
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The backticks/gravemarks have been deprecated in favor of $() for command substitution because $() can easily nest within itself as in $(echo foo$(echo bar)). There are other differences such as how backslashes are parsed in the backtick/gravemark version, etc.
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Setting environment variables via launchd.conf no longer works in OS X Yosemite/El Capitan/macOS Sie
.../mortimer/Projects/my_products
launchctl setenv ANDROID_NDK_HOME /Applications/android-ndk
launchctl setenv PATH $PATH:/Applications/gradle/bin
</string>
</array>
<key>RunAtLoad</key>
<true/>
</dict>
</plist>
You can add many launchctl c...
R script line numbers at error?
...re concerned about (e.g. connecting to a database), then wrap them in a tryCatch() function.
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What use is find_package() if you need to specify CMAKE_MODULE_PATH anyway?
... actually need Config mode.
Module mode
Find<package>.cmake file located within your project. Something like this:
CMakeLists.txt
cmake/FindFoo.cmake
cmake/FindBoo.cmake
CMakeLists.txt content:
list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/cmake")
find_package(Foo REQUIRED) # ...
Efficiently test if a port is open on Linux?
...t;>/dev/tcp/ip.addr.of.server/445
echo -e "GET / HTTP/1.0\n" >&6
cat <&6
I'm using 6 as the file descriptor because 0,1,2 are stdin, stdout, and stderr. 5 is sometimes used by Bash for child processes, so 3,4,6,7,8, and 9 should be safe.
As per the comment below, to test for list...