How to extract the images from a PDF file in Linux?
You may use the pdfimages tool.
To output jpg images from a PDF ./a.pdf, run
pdfimages -j ./a.pdf ./images
./images is the output images’ prefix. The images in ./a.pdf will be extracted and saved as ./images-nnn.jpg.
-j options make pdfimages generate JPEG files.
Chrome reads the proxy settings from Gnome correctly. However, when I run Chrome under KDE, the proxy integration is broken: In the settings of Chrome, clicking the “Change proxy settings” opens the KDE proxy setting dialog correctly (the command kcmshell4 proxy actually is executed). However, after the proxy settings are made, Chrome does not read…
What is the implementation of strstr in glibc? Implementation of STRSTR in glibc (string/strstr.c): /* Return the first occurrence of NEEDLE in HAYSTACK. Return HAYSTACK if NEEDLE is empty, otherwise NULL if NEEDLE is not found in HAYSTACK. */ char * STRSTR (const char *haystack_start, const char *needle_start) { const char *haystack = haystack_start; const…
MAC stands for Media Access Control which is a six byte number, usually expressed as a twelve digit hexadecimal number. IPs in LAN are translated to MAC address by the ARP (Address Resolution Protocol) protocol. For some reasons such as keeping the true MAC address from being logged, accessing to the network which bounds IPs…
How to use multi-hop ssh connection without needs to ssh multiple times? As a example, you are connecting to server.example.com through proxy.example.com from laptop.example.com as follows: laptop —-> proxy —-> server 2 possible methods: Method 1: Use the similar method as in Directly SSH to hosts using internal IPs through the gateway. Add this to…
How to detect whether a file is being written by any other process in Linux? Before a program open a file to processes it, it wants to ensure no other processes are writing to it. Here, we are sure after the files are written and closed, they will not be written any more. Hence, one-time…
Fedora 一直有中文字体难看的问题, 尤其是在英文环境中. 使用本文中的配置方法可以得到令人满意的中文效果. 此方案中使用字体都为开源且在Fedora源中自带. 此方案对 Fedora 9 – 20 有效. 对于后续版本支持我会确认并更新此文章. 此方案对Gnome, KDE都有效. Firefox 中也有中文难看的问题, 后面会提到. 快速配置方法 如果你想马上配置好，请使用如下命令。此方法测试使用效果良好。 # yum install cjkuni-ukai-fonts cjkuni-uming-fonts # wget https://raw.githubusercontent.com/zma/config_files/master/others/local.conf \ -O /etc/fonts/local.conf 相关英文字体配置可以参考：Improving Fedora Font Rendering with Open Software and Fonts Only. Fedora 系统中文字体的配置方案 使用uming和ukai字体，即AR PL UMing CN等. 中文字体和等宽字体效果如图所示(点击看大图, Firefox 中文字体设置在后面会提到). 方法如下: 安装字体 首先安装这两个字体: cjkuni-ukai-fonts cjkuni-uming-fonts (在Fedora…