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How do I revert all local changes in Git managed project to previous state?
...d $i to a" ;done > /dev/null
$ git reset --hard HEAD^^ > /dev/null
$ cat a
foo
b
c
$ git reflog
145c322 HEAD@{0}: HEAD^^: updating HEAD
ae7c2b3 HEAD@{1}: commit: Append e to a
fdf2c5e HEAD@{2}: commit: Append d to a
145c322 HEAD@{3}: commit: Append c to a
363e22a HEAD@{4}: commit: Append b to ...
FFmpeg: How to split video efficiently?
... you can use the following cmdl:
MP4Box -splits 716800 input.mp4
eg for concatenating two files you can use:
MP4Box -cat file1.mp4 -cat file2.mp4 output.mp4
Or if you need split by time, use -splitx StartTime:EndTime:
MP4Box -add input.mp4 -splitx 0:15 -new split.mp4
...
How to print the ld(linker) search path
...g makefile from configure script or from CMakeLists.txt or even more complicated ones such as vala or srt. It's hard for me to modify ld search path in such cases
– kenn
Sep 9 '14 at 10:18
...
Regex Pattern to Match, Excluding when… / Except between
...to be more obscure, you could use (*SKIP)(?!)
demo for this version
Applications
Here are some common problems that this technique can often easily solve. You'll notice that the word choice can make some of these problems sound different while in fact they are virtually identical.
How can I ma...
How to call one shell script from another shell script?
...se /bin/sh to call or execute another script (via your actual script):
# cat showdate.sh
#!/bin/bash
echo "Date is: `date`"
# cat mainscript.sh
#!/bin/bash
echo "You are login as: `whoami`"
echo "`/bin/sh ./showdate.sh`" # exact path for the script file
The output would be:
# ./mainscri...
How can two strings be concatenated?
How can I concatenate (merge, combine) two values?
For example I have:
12 Answers
12
...
Timeout a command in bash without unnecessary delay
...ss by SIGKILL.
declare -i delay=DEFAULT_DELAY
function printUsage() {
cat <<EOF
Synopsis
$scriptName [-t timeout] [-i interval] [-d delay] command
Execute a command with a time-out.
Upon time-out expiration SIGTERM (15) is sent to the process. If SIGTERM
signal is blocked...
In Git, how can I write the current commit hash to a file in the same commit
...=${branch_name##refs/heads/}
branch_name=${branch_name:-HEAD} # 'HEAD' indicates detached HEAD situation
# Write it
echo -e "prev_commit='$commit_hash'\ndate='$commit_date'\nbranch='$branch'\n" > gitcommit.py
Now the only thing we need is a tool that converts prev_commit,branch pair to a real ...
Compare two files line by line and generate the difference in another file
...ordered in to ascending or descending order e.g. "\1\n2\n3\n3\n" with duplicates adjacent. That is "sorted" and both files must be sorted in a similar manner. When the newer file has new lines it does not matter if they are "between existing lines" because after the sort they are not, they're in sor...
How to pass macro definition from “make” command line arguments (-D) to C source code?
...
Just use a specific variable for that.
$ cat Makefile
all:
echo foo | gcc $(USER_DEFINES) -E -xc -
$ make USER_DEFINES="-Dfoo=one"
echo foo | gcc -Dfoo=one -E -xc -
...
one
$ make USER_DEFINES="-Dfoo=bar"
echo foo | gcc -Dfoo=bar -E -xc -
...
bar
$ make
...