#文件测试操作-d FILE_NAM # TrueifFILE_NAM is a directory-e FILE_NAM # TrueifFILE_NAM exists-f FILE_NAM # TrueifFILE_NAM existsandis a regular file-r FILE_NAM # TrueifFILE_NAM is readable-s FILE_NAM # TrueifFILE_NAM existsandisnotempty...
Check Empty String AI检测代码解析 1 2 3 4 5 6 1. 2. 3. 4. 5. 6. AI检测代码解析 if [[ -z "$emptyString" ]]then echo "Empty"else echo "Not Empty"fi 1. Here is a reference material from Stackoverflowhttp://stackoverflow.com/questions/3767267/check-if-file-exists...
test -f /etc/fstab ## true if a regular file test -h /etc/rc.local ## true if a symbolic link [ -x "$HOME/bin/hw" ] ## true if you can execute the file [[ -s $HOME/bin/hw ]] ## true if the file exists and is not empty 整数测试 整数之间的比较使用-eq、-ne、-gt...
if[ -n"$empty_string"];then echo"empty string is non_empty" fi if[ -e"${HOME}/.fvwmrc"];then# test to see if ~/.fvwmrc exists echo"you have a .fvwmrc file" if[ -L"${HOME}/.fvwmrc"];then# is it a symlink ? echo"it's a symbolic link elif[ -f"${HOME}/.fvwmrc"]...
( A)我是初出茅庐# check if constant existsfunction checkIfExistAndNonEmpty() { arg1= 浏览0提问于2020-05-24得票数 0 10回答 如何在Bash中查找变量是否为空 、、 如何检查Bash中的变量是否为空? 浏览10提问于2010-06-17得票数 309 回答已采纳 ...
Open up you favorite text editor and a create file called hello_world.sh. Insert the following lines to a file: NOTE:Every bash shell script in this tutorial starts withshebang:"#!"which is not read as a comment. First line is also a place where you put your interpreter which is in...
# Check if a command exists command -v $1 &> /dev/null if [[ $? -eq 0 ]]; then return 0 else return 1 fi } pkg-install () { pkg="${1:?"Error: pkg parameter unset."}" step "${msg_install}: ${pkg}" substep "Installing ${pkg} from the Arch Linux Repositories." ...
echo "Count is positive." else echo "Count is zero or negative." fi Example 2: String Comparison !/bin/bash name="Alice" if [ "$name" == "Alice" ] then echo "Hello, Alice!" else echo "You are not Alice." fi Example 3: File Check ...
sbopkg, slackpkg, slapt-{get,src}: Use shorter form of the check if file exists. (3388314) rmmod: Add option completions. (47c49db) testsuite/generate: Generate less linefeeds. (068e422) insmod: Install for insmod.static too. (d02b4e1) mplayer: Add -monitoraspect arg completion. (a90...
[ -e FILE ] True if FILE exists. [ -f FILE ] True if FILE exists and is a regular file. [ -d FILE ] True if FILE exists and is a directory. [ -s FILE ] True if FILE exists and not empty (size more than 0). [ -r FILE ] True if FILE exists and is readable. [ -w ...